docs: Add release guide

website/docs/contributing/_category_.yml

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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+position: 4
+label: 'Contributing'
+collapsible: true
+collapsed: true
+link:
+  type: generated-index
+  title: Contributing

website/docs/contributing/reference/_category_.yml

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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+position: 2
+label: 'Reference'
+collapsible: true
+collapsed: true
+link:
+  type: generated-index
+  title: Reference

website/docs/contributing/reference/generate_release_note.md

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+---
+title: Generate Release Note
+---
+
+This document describes how to generate release notes using Github:
+
+1. Go to https://github.com/apache/incubator-opendal/releases/new to start a new release.
+2. Fill the tag with `draft`.
+3. Click on `Generate release notes` to generate them.
+4. Copy the generated content and close the page.
+
+Please note that we only use this feature to generate release notes, so please do not click on `Publish Release` or `Save draft`. We will publish it after creating the tag.

website/docs/contributing/reference/setup_gpg.md

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+---
+title: Setup GPG Key
+---
+
+> This section is a brief from the [Cryptography with OpenPGP](https://infra.apache.org/openpgp.html) guideline.
+
+## Install gpg
+
+For more details, please refer to [GPG official website](https://www.gnupg.org/download/index.html). Here shows one approach to install GPG with `apt`:
+
+```shell
+sudo apt install gnupg2
+```
+
+## Generate gpg Key
+
+Attentions:
+
+- Name is best to keep consistent with your full name of Apache ID;
+- Email should be the Apache email;
+- Name is best to only use English to avoid garbled.
+
+Run `gpg --full-gen-key` and complete the generation interactively:
+
+```shell
+gpg (GnuPG) 2.2.20; Copyright (C) 2020 Free Software Foundation, Inc.
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.
+
+Please select what kind of key you want:
+   (1) RSA and RSA (default)
+   (2) DSA and Elgamal
+   (3) DSA (sign only)
+   (4) RSA (sign only)
+  (14) Existing key from card
+Your selection? 1 # input 1
+RSA keys may be between 1024 and 4096 bits long.
+What keysize do you want? (2048) 4096 # input 4096
+Requested keysize is 4096 bits
+Please specify how long the key should be valid.
+         0 = key does not expire
+      <n>  = key expires in n days
+      <n>w = key expires in n weeks
+      <n>m = key expires in n months
+      <n>y = key expires in n years
+Key is valid for? (0) 0 # input 0
+Key does not expire at all
+Is this correct? (y/N) y # input y
+
+GnuPG needs to construct a user ID to identify your key.
+
+Real name: Hulk Lin               # input your name
+Email address: [email protected]    # input your email
+Comment:                          # input some annotations, optional
+You selected this USER-ID:
+    "Hulk <[email protected]>"
+
+Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? O # input O
+We need to generate a lot of random bytes. It is a good idea to perform
+some other action (type on the keyboard, move the mouse, utilize the
+disks) during the prime generation; this gives the random number
+generator a better chance to gain enough entropy.
+We need to generate a lot of random bytes. It is a good idea to perform
+some other action (type on the keyboard, move the mouse, utilize the
+disks) during the prime generation; this gives the random number
+generator a better chance to gain enough entropy.
+
+# Input the security key
+┌──────────────────────────────────────────────────────┐
+│ Please enter this passphrase                         │
+│                                                      │
+│ Passphrase: _______________________________          │
+│                                                      │
+│       <OK>                              <Cancel>     │
+└──────────────────────────────────────────────────────┘
+# key generatio[n will be done after your inputting the key with the following output
+gpg: key E49B00F626B marked as ultimately trusted
+gpg: revocation certificate stored as '/Users/hulk/.gnupg/openpgp-revocs.d/F77B887A4F25A9468C513E9AA3008E49B00F626B.rev'
+public and secret key created and signed.
+
+pub   rsa4096 2022-07-12 [SC]
+      F77B887A4F25A9468C513E9AA3008E49B00F626B
+uid           [ultimate] hulk <[email protected]>
+sub   rsa4096 2022-07-12 [E]
+```
+
+## Upload your key to public gpg keyserver
+
+Firstly, list your key:
+
+```shell
+gpg --list-keys
+```
+
+The output is like:
+
+```shell
+-------------------------------
+pub   rsa4096 2022-07-12 [SC]
+      F77B887A4F25A9468C513E9AA3008E49B00F626B
+uid           [ultimate] hulk <[email protected]>
+sub   rsa4096 2022-07-12 [E]
+```
+
+Then, send your key id to key server:
+
+```shell
+gpg --keyserver keys.openpgp.org --send-key <key-id> # e.g., F77B887A4F25A9468C513E9AA3008E49B00F626B
+```
+
+Among them, `keys.openpgp.org` is a randomly selected keyserver, you can use `keyserver.ubuntu.com` or any other full-featured keyserver.
+
+## Check whether the key is created successfully
+
+Uploading takes about one minute, after that, you can check by your email at the corresponding keyserver.
+
+Uploading keys to the keyserver is mainly for joining a [Web of Trust](https://infra.apache.org/release-signing.html#web-of-trust).
+
+## Add your gpg public key to the KEYS document
+
+:::info
+
+SVN is required for this step.
+
+:::
+
+The svn repository of the release branch is: https://dist.apache.org/repos/dist/release/incubator/opendal
+
+Please always add the public key to KEYS in the release branch:
+
+```shell
+svn co https://dist.apache.org/repos/dist/release/incubator/opendal opendal-dist
+# As this step will copy all the versions, it will take some time. If the network is broken, please use svn cleanup to delete the lock before re-execute it.
+cd opendal-dist
+(gpg --list-sigs [email protected] && gpg --export --armor [email protected]) >> KEYS # Append your key to the KEYS file
+svn add .   # It is not needed if the KEYS document exists before.
+svn ci -m "add gpg key for YOUR_NAME" # Later on, if you are asked to enter a username and password, just use your apache username and password.
+```
+
+## Upload the GPG public key to your GitHub account
+
+- Enter https://github.com/settings/keys to add GPG KEYS.
+- Please remember to bind the email address used in the GPG key to your GitHub account (https://github.com/settings/emails) if you find "unverified" after adding it.