add github actions to build containers

.github/workflows/build_containers.yml

@@ -0,0 +1,23 @@
+name: build_containers
+
+on:
+  push:
+    branches: [ master ]
+  schedule:
+    - cron: "0 3 * * 1"   # every monday at a 3am
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build_container:
+    strategy:
+      fail-fast: false
+      matrix:
+        container:
+          - base-bullseye
+    uses: ./.github/workflows/build_single_container.yml
+    with:
+      container: "${{ matrix.container }}"
+    secrets: inherit

.github/workflows/build_single_container.yml

@@ -0,0 +1,26 @@
+name: build_single_container
+on:
+  workflow_dispatch:
+    inputs:
+      container:
+        description: "Which container to build"
+        type: string
+        required: true
+  workflow_call:
+    inputs:
+      container:
+        description: "Which container to build"
+        required: true
+        type: string
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build_container:
+    name: "Build ${{ inputs.container }}"
+    uses: fsinfuhh/workflows/.github/workflows/build_image.yml@main
+    with:
+      image_base_name: "${{ inputs.container }}"
+    secrets: inherit