Implement action that returns desired maven goal

.gitignore

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+.idea
+
+node_modules

README.md

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+# Set Revision javascript action
+
+This action uses the github reference of the caller context,
+and returns the desired Maven Revision property according to
+our specification. This property is also
+exported in the Github Environment as `REVISION`.
+Our specification, in short, is as follows:
+- Tags remain unchained
+- Default branches are renamed to `latest`
+- Non-default branches are appended with a `-SNAPSHOT` suffix
+
+## Inputs
+
+### acr
+
+True if the application deploys docker images to Azure Container Registry using Jib, otherwise false.
+
+### gpr
+
+True if the application deploys JARs to Github Package Registry, otherwise false.
+
+## Outputs
+
+### `revision`
+
+The appropriate `revision` value.
+This value is also exported in the Github Environment as `REVISION`.
+
+## Example usage
+
+```yaml
+uses: digipost/[email protected]
+```
+
+## Building this project
+
+Make desired changes in `index.js` (and/or other files). Then run
+
+```
+ncc build index.js
+```
+
+to generate the dist/index.js file
+
+## Links
+
+- [Great guide for creating JavaScript Actions](https://docs.github.com/en/actions/creating-actions/creating-a-javascript-action)
+- [Vercel NCC on Github](https://github.com/vercel/ncc)

action.yml

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+name: 'Set Maven Goals'
+description: 'Exports a MVN_GOALS environment variable based on combination of input variables'
+inputs:
+  acr:
+    description: True if the app deploys docker images to Azure Container Registry, otherwise false
+    required: false
+    default: 'false'
+  gpr:
+    description: True if the app deploys JARs to Github Package Registry using deploy, otherwise false
+    required: false
+    default: 'false'
+outputs:
+  maven-goals:
+    description: 'The value of the maven goal variable'
+runs:
+  using: 'node16'
+  main: 'dist/index.js'