Push container images to GitHub instead of Google Container Registry

.github/workflows/container-image-squid.yml

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+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: "Build and push the Squid container image"
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - 'modules/cloud-config-container/squid/docker/**'
+
+jobs:
+  build-push-squid-container-image:
+    uses: ./.github/workflows/container-image.yml
+    with:
+      image_name: squid
+      docker_context: modules/cloud-config-container/squid/docker

.github/workflows/container-image-strongswan.yml

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+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: "Build and push the strongSwan container image"
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - 'modules/cloud-config-container/onprem/docker-images/strongswan/**'
+
+jobs:
+  build-push-strongswan-container-image:
+    uses: ./.github/workflows/container-image.yml
+    with:
+      image_name: strongswan
+      docker_context: modules/cloud-config-container/onprem/docker-images/strongswan

.github/workflows/container-image-toolbox.yml

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+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: "Build and push the Toolbox container image"
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - 'modules/cloud-config-container/onprem/docker-images/toolbox/**'
+
+jobs:
+  build-push-toolbox-container-image:
+    uses: ./.github/workflows/container-image.yml
+    with:
+      image_name: toolbox
+      docker_context: modules/cloud-config-container/onprem/docker-images/toolbox

.github/workflows/container-image.yml

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+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: "Build and push a generic container image"
+
+on:
+  workflow_call:
+    inputs:
+      image_name:
+        required: true
+        type: string
+      docker_context:
+        required: true
+        type: string
+
+jobs:
+  build-push-generic-container-image:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Get current date
+        id: date
+        run: echo "::set-output name=date::$(date +'%Y%m%d')"
+
+      - name: Login to GHCR
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: ${{ inputs.docker_context }}
+          push: true
+          tags: |
+            ghcr.io/${{ github.repository_owner }}/${{ inputs.image_name }}:latest
+            ghcr.io/${{ github.repository_owner }}/${{ inputs.image_name }}:${{ steps.date.outputs.date }}