feat: add github workflow

Author: vrenaville

Diff for: .github/workflows/workflow.yml

@@ -0,0 +1,39 @@
+name: Test, build and push to github packages
+on:
+  pull_request:
+    branches:
+      - 'master'
+  push:
+    branches:
+      - '*'
+    tags:
+      - '*.*.*'
+
+jobs:
+  build-images:
+    if: ${{ github.event_name == 'push' }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set ENV for branch master/main
+        if: ${{ github.ref == 'refs/heads/master' }}
+        run: echo "RELEASE_VERSION=latest" >> $GITHUB_ENV
+      - name: Set ENV for tags
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+      - name: Set ENV for specific branch
+        if: ${{ startsWith(github.ref, 'refs/heads/') && !endsWith(github.ref, '/master') }}
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}-${GITHUB_SHA}" >> $GITHUB_ENV
+      - name: Login to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build Image Odoo Nginx
+        uses: docker/build-push-action@v2
+        with:
+          context: ./9.0
+          platforms: linux/amd64
+          push: true
+          tags: ghcr.io/${{ github.repository }}:${{ env.RELEASE_VERSION }}