feat(copy): add copy policy.

updatecli/policies/copy/CHANGELOG.md

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+# CHANGELOG
+
+## 0.1.0
+
+  * Initial release

updatecli/policies/copy/Policy.yaml

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+---
+# Policy.yaml contains metadata for the Updatecli policy.
+
+# Authors is the policy authors
+authors:
+  - José Guilherme Vanz <[email protected]>
+
+# URL is the policy url
+url: "https://github.com/updatecli/policies/"
+
+# Documentation is the policy documentation URL
+documentation: "https://github.com/updatecli/policies/tree/main/updatecli/policies/copy/README.md"
+
+# Source is the policy source URL
+source: "https://github.com/updatecli/policies/tree/main/updatecli/policies/copy/"
+
+# Version is the policy version. 
+version: 0.1.0
+
+# Vendor is the policy vendor
+vendor: Updatecli project
+
+# License is the policy licenses
+licenses:
+  - "Apache-2.0 license"
+
+# Description is the short policy description
+description: |
+  Copy files from a git repository to a local file

updatecli/policies/copy/README.md

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+## DESCRIPTION
+
+This policy can be used to copy files from a source repository to a local file
+
+
+Here is a basic example of a configuration
+
+```values.yaml
+
+src:
+  url: "https://github.com/updatecli/updatecli.git"
+  branch: "main"
+
+files:
+  - src: .golangci.yml
+    dst: .golangci.yml
+  - src: _typos.toml
+    dst: _typos.toml
+  - src: codecov.yaml
+    dst: codecov.yaml
+  - src: .gitignore
+    dst: .gitignore
+```
+
+Then you can execute this policy running:
+
+```
+updatecli diff --values values.yaml ghcr.io/updatecli/policies/updatecli/copy:latest
+```

updatecli/policies/copy/testdata/values.yaml

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+src:
+  url: "https://github.com/updatecli/updatecli.git"
+  branch: "main"
+
+files:
+  - src: .golangci.yml
+    dst: .golangci.yml
+  - src: _typos.toml
+    dst: _typos.toml
+  - src: codecov.yaml
+    dst: codecov.yaml
+  - src: .gitignore
+    dst: .gitignore

updatecli/policies/copy/updatecli.d/default.yaml

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+---
+# Helpers
+# {{ $DefaultTitle := (print "copy file(s) from " .src.url ) }}
+
+name: '{{ default $DefaultTitle .title }}'
+
+# {{ if .pipelineid }}
+pipelineid: '{{ .pipelineid }}'
+# {{ end }}
+
+# scms defines the source control management system to interact with.
+scms:
+  source:
+    kind: git
+    spec:
+      url: "{{ .src.url }}"
+      branch: "{{ .src.branch }}"
+
+# sources defines where to find the information.
+sources:
+# {{ range $index, $file := .files }}
+  {{ $index }}:
+    name: 'Get {{$file.src }} from source repository'
+    scmid: 'source'
+    kind: 'file'
+    spec:
+      file: '{{ $file.src }}'
+# {{ end }}
+
+## targets defines where to apply the changes.
+targets:
+# {{ range $index, $file := .files }}
+  "{{ $index }}":
+    name: 'sync {{ $file.dst }} file'
+    kind: 'file'
+    sourceid: '{{ $index }}'
+    spec:
+      file: '{{ $file.dst }}'
+      forcecreate: true
+# {{ end }}

updatecli/policies/copy/values.yaml

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+---
+# Values.yaml contains settings that be used from Updatecli manifest.
+
+## title override the default title of the policy
+#title: "chore: sync file from source repository"
+
+## files contains the list of files to be copied from the source repository to the target repository.
+#files:
+#  - src: ""
+#    dst: ""
+
+## pipelineid is the pipeline id to be used by the policy
+## It is used to identify the pipeline that is running the policy.
+## Different pipelines sharing the same pipelineid and the same scm configuration
+## will update the same pullrequest
+#pipelineid: "file"
+
+
+## src contains the source repository information
+## It is used to fetch the files to be copied to the target repository
+#src:
+#  url: ""
+#  branch: ""