initial implementation

Signed-off-by: Nicolas De Loof <[email protected]>

Author: ndeloof

.github/workflows/ci.yml

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+name: Continuous Integration
+
+on:
+  push:
+    branches:
+      - 'master'
+  pull_request:
+    branches:
+      - 'master'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        release: [latest, v2.2.0]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install Compose
+        uses: ./
+        with:
+          version: ${{ matrix.release }}
+
+      - name: Test installation
+        run: |
+          docker compose version
+          docker-compose --version

README.md

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+# Install Docker Compose
+
+This GitHub Action installs Docker Compose v2
+
+## Usage
+
+```yaml
+jobs:
+  my-awesome-job:
+    steps:
+      - name: Install Compose
+        uses: ndeloof/install-docker-compose
+        with:
+          version: v2.1.0 # defaults to 'latest'
+          legacy: true    # will also install in PATH as `docker-compose`
+```

action.yml

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+# https://help.github.com/en/articles/metadata-syntax-for-github-actions
+name: Docker Compose Setup
+description: Install Docker Compose
+branding:
+  icon: anchor
+  color: blue
+
+inputs:
+  version:
+    description: 'Compose release (example: v2.2.0)'
+    required: false
+    default: latest
+  legacy:
+    description: 'Also install as legacy "docker-compose"'
+    required: false
+    default: true
+
+runs:
+  using: 'composite'
+  steps:
+    - name: install 
+      shell: bash
+      run: |
+        set -x
+        set -e
+        arch="$(uname)-$(uname -m)"
+        flavor=$(echo $arch | tr '[:upper:]' '[:lower:]' )
+
+        DOWNLOAD_URL="https://github.com/docker/compose/releases/download/${{ inputs.version }}/docker-compose-${flavor}"
+        if [[ "${{ inputs.version }}" == "latest" ]]; then
+          DOWNLOAD_URL=$(curl -fL https://api.github.com/repos/docker/compose/releases/latest | jq -r '.assets[] | select(.name == "docker-compose-linux-x86_64") | .browser_download_url')
+        fi
+
+        echo "Download Compose ${{ inputs.version }} for ${flavor} from ${DOWNLOAD_URL}"
+        mkdir -p ~/.docker/cli-plugins/
+        curl -fsSL "$DOWNLOAD_URL" -o ~/.docker/cli-plugins/docker-compose
+        chmod +x ~/.docker/cli-plugins/docker-compose
+    - name: alias docker-compose
+      if: ${{ inputs.legacy }}
+      shell: bash
+      run: |
+        mkdir -p ~/.local/bin/
+        ln -s ~/.docker/cli-plugins/docker-compose ~/.local/bin/docker-compose 
+