Add CI that tests building the docker images

Author: jolelievre

.github/workflows/build.yml

@@ -0,0 +1,34 @@
+---
+name: Build containers
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  get_json_versions:
+    runs-on: ubuntu-latest
+    steps:
+      # Fetch versions to work for images
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+      - id: set-versions
+        run: echo "::set-output name=versions::$(./get_json_versions.py)"
+
+    outputs:
+      versions: ${{ steps.set-versions.outputs.versions }}
+
+  build_images:
+    runs-on: ubuntu-latest
+    needs: publish_base
+    strategy:
+      fail-fast: false
+      matrix:
+        ps-version: ${{ fromJson(needs.get_json_versions.outputs.versions) }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build Docker image
+        run: docker build --quiet=true images/${version}

.github/workflows/publish.yml

@@ -44,11 +44,6 @@ jobs:
         if: ${{ github.event_name == 'pull_request' }}
         working-directory: base
 
-      - name: Base Images > Docker Build & Push
-        if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' && steps.changes.outputs.base != 'true'  }}
-        run: ./docker_tags.sh -p
-        working-directory: base
-
       - name: Base Images > Docker Build & Push
         if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' && steps.changes.outputs.base == 'true' }}
         run: ./docker_tags.sh -p -f