Add action

.github/workflows/main.yml

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+name: Test
+
+on:
+  push:
+  workflow_dispatch:
+    inputs:
+      tramline-input:
+        required: false
+
+jobs:
+  deploy_job:
+    runs-on: ubuntu-latest
+    name: A job to test tramline deploys
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Deploy
+        uses: ./ # Uses the action in the root directory
+        id: tramline
+        with:
+          input: ${{ github.event.inputs.tramline-input }}
+      - name: Get the output
+        run: |
+          echo "vcode: ${{ steps.tramline.outputs.version_code }}"
+          echo "vname: ${{ steps.tramline.outputs.version_name }}"
+          echo "cref: ${{ steps.tramline.outputs.commit_ref }}"

Dockerfile

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+# Container image that runs your code
+FROM alpine:3.10
+
+# Copies your code file from your action repository to the filesystem path `/` of the container
+COPY entrypoint.sh /entrypoint.sh
+
+# Code file to execute when the docker container starts up (`entrypoint.sh`)
+ENTRYPOINT ["/entrypoint.sh"]

action.yml

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+# action.yml
+name: 'Configure Tramline'
+description: 'Checkout the correct ref & parse JSON inputs'
+inputs:
+  input:
+    description: "Input from Tramline as a JSON blob"
+    required: true
+    default: "{}"
+outputs:
+  version_code:
+    description: 'the version code (build number) for the build'
+    value: ${{ steps.tramline.outputs.version_code }}
+  version_name:
+    description: 'the version name for the build'
+    value: ${{ steps.tramline.outputs.version_name }}
+  commit_ref:
+    description: 'the commit for which this workflow is triggered'
+    value: ${{ steps.tramline.outputs.commit_ref }}
+runs:
+  using: "composite"
+  steps:
+    - name: Parse inputs from Tramline
+      run: ./parse_inputs.sh ${{ inputs.input }}
+      id: tramline
+      shell: bash
+
+    - name: Checkout the repo
+      uses: actions/checkout@v3
+      with:
+        ref: ${{ steps.tramline.outputs.commit_ref }}

parse_inputs.sh

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+#!/bin/bash -l
+
+echo "Starting tramline input parsing..."
+
+# Install jq if it doesn't exist
+if ! command -v jq &> /dev/null
+then
+    echo "jq is not installed. Installing..."
+    sudo apt-get update
+    sudo apt-get install -y jq
+else
+    echo "jq is already installed. Skipping..."
+fi
+
+# Parse JSON and store keys in an array
+echo $1 > tramline_input.json
+keys=()
+while read -r value
+do
+    keys+=("$value")
+done < <(jq -c 'keys_unsorted[]' tramline_input.json)
+
+# Exit if there are parse errors
+if [ -z "$keys" ]; then
+    echo "Error parsing Tramline inputs. Exiting..."
+    exit 1
+fi
+
+# Loop through the keys and set variables
+for key in "${keys[@]}"; do
+    # Get the value of the key from JSON
+    value=$(jq -r ".$key" tramline_input.json)
+    # Remove double quotes from key
+    key="${key//\"/}"
+    # Assign the value to a variable with a name based on the key
+    output="${key}=${value}"
+    # Output
+    echo $output >> "$GITHUB_OUTPUT"
+done
+
+# Cleanup
+rm -f tramline_input.json
+echo "Finishing up tramline input parsing..."