Migrate CI to ENF runners & new platform framework

.cicd/actions/discover-platforms-action/LICENSE

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+Copyright (c) 2022 EOS Network Foundation (ENF)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

.cicd/actions/discover-platforms-action/README.md

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+## Discover Platform Image Names & Missing Images
+
+This action discovers the appropriate container registry image tags for a collection of "platforms" (Dockerfiles) defined in the current repo. The returned values are based on the owner of the repo, a configured package name, and the sha256 of the Dockerfile. It will also return an array of platform names whose images are not present in the container registry so the workflow can then go on to build and push them (this action will _not_ build and push them, as most likely you'd want to parallelize them in a follow on matrix'ed job).
+
+### Inputs
+
+Three inputs are required:
+* **platform-file** - Path to file in repository that defines platforms & dockerfiles
+* **package-name** - The package name in this repo owner's container registry to look for existing container images
+* **password** - Token that has read access to repository & package in container registry
+
+Example:
+```
+    steps:
+      - name: Discover Platforms
+        id: discover
+        uses: AntelopeIO/discover-platforms-action@v1
+        with:
+          platform-file: .cicd/platforms.json
+          password: ${{secrets.GITHUB_TOKEN}}
+          package-name: builder
+```
+Where `.cicd/platforms.json` is, for example
+```json
+{
+   "ubuntu18": {
+      "dockerfile": ".cicd/platforms/ubuntu18.Dockerfile"
+   },
+   "ubuntu20": {
+      "dockerfile": ".cicd/platforms/ubuntu20.Dockerfile"
+   }
+}
+```
+
+### Outputs
+* **platforms** - The object from the `platform-file` input (see above) but with the container image and tag added
+* **missing-platforms** - An array of platforms that were not found in the container registry (could be an empty array)
+
+Example for `platforms`:
+```json
+{
+  ubuntu18: {
+    dockerfile: '.cicd/platforms/ubuntu18.Dockerfile',
+    image: 'ghcr.io/AntelopeIO/builder:8c724d9fe6f9819d9f0bd6bdff592dd971d17bd8b69fa7fef05897b8ba7e0291'
+  },
+  ubuntu20: {
+    dockerfile: '.cicd.platforms/ubuntu20.Dockerfile',
+    image: 'ghcr.io/AntelopeIO/builder:130e29695cbbd21fe2ad5c5ba6e320888a97417ddc7baa0a7a6f7b3cd145cbd2'
+  }
+}
+```
+
+Example `missing-platforms`:
+```json
+["ubuntu18", "ubuntu20"]
+```
+or if both tags in the above example had already existed,
+```json
+[]
+```
+
+### Rebuilding `dist`
+```
+ncc build main.mjs --license licenses.txt
+```
+

.cicd/actions/discover-platforms-action/action.yml

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+name: 'Discover Platforms'
+description: 'Discover Platform Tags & Unbuilt Platform Tags'
+inputs:
+  platform-file:
+    required: true
+  password:
+    required: true
+  package-name:
+    required: true
+outputs:
+  missing-platforms:
+    description: 'Array of platforms that need to be built'
+  platforms:
+    description: 'Populated map with platform:{dockerfile, tag}'
+runs:
+  using: 'node16'
+  main: 'dist/index.mjs'