add cache to OGC workflow for Docker build and QGIS build (#43897)

* add cache to OGC workflow for Docker build and QGIS build

* fix context

* Update ogc.yml

* fix context

.ci/ogc/Dockerfile

@@ -6,6 +6,7 @@ ENV  DEBIAN_FRONTEND noninteractive
 RUN apt-get update \
     && apt-get upgrade -y \
     && apt-get install -y \
+  ccache \
   cmake \
   ninja-build \
   clang \

.ci/ogc/build.sh

@@ -3,7 +3,16 @@
 mkdir /usr/src/qgis/build
 cd /usr/src/qgis/build || exit 1
 
+export CCACHE_TEMPDIR=/tmp
+# Github workflow cache max size is 2.0, but ccache data get compressed (roughly 1/5?)
+ccache -M 2.0G
+
+# Temporarily uncomment to debug ccache issues
+# export CCACHE_LOGFILE=/tmp/cache.debug
+ccache -z
+
 cmake -GNinja \
+ -DUSE_CCACHE=ON \
  -DWITH_QUICK=OFF \
  -DWITH_3D=OFF \
  -DWITH_STAGED_PLUGINS=OFF \
@@ -34,3 +43,6 @@ cmake -GNinja \
  ..
 
 ninja
+
+echo "ccache statistics"
+ccache -s

.github/workflows/ogc.yml

@@ -36,13 +36,50 @@ jobs:
       - name: Checkout
         uses: actions/checkout@master
 
-      - name: Setup build dependencies
-        run: |
-          docker build -t qgis_server_deps -f .ci/ogc/Dockerfile .ci/ogc/
+      - name: Prepare build cache for pull request
+        uses: pat-s/always-upload-cache@v2.1.5
+        if: github.event_name == 'pull_request'
+        with:
+          path: /home/runner/QGIS/.ccache
+          key: build-ccache-ogc-${{ github.actor }}-${{ github.head_ref }}-${{ github.sha }}
+          # The head_ref or source branch of the pull request in a workflow run.
+          # The base_ref or target branch of the pull request in a workflow run.
+          restore-keys: |
+            build-ccache-ogc-${{ github.actor }}-${{ github.head_ref }}-
+            build-ccache-ogc-refs/heads/${{ github.base_ref }}-
+            build-ccache-ogc-refs/heads/master-
+
+      - name: Prepare build cache for branch/tag
+        # use a fork of actions/cache@v2 to upload cache even when the build or test failed
+        uses: pat-s/always-upload-cache@v2.1.5
+        if: github.event_name != 'pull_request'
+        with:
+          path: /home/runner/QGIS/.ccache
+          # The branch or tag ref that triggered the workflow run. For branches this in the format refs/heads/<branch_name>, and for tags it is refs/tags/<tag_name>
+          key: build-ccache-ogc-${{ github.ref }}-${{ github.sha }}
+          restore-keys: |
+            build-ccache-ogc-${{ github.ref }}-
+            build-ccache-ogc-refs/heads/master-
+
+      - name: Build Docker Container with Build Environment
+        id: docker-build
+        uses: whoan/docker-build-with-cache-action@v5
+        with:
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+          registry: docker.pkg.github.com
+          image_name: qgis-deps-ogc
+          context: .ci/ogc
+          dockerfile: Dockerfile
+          push_git_tag: true
+          push_image_and_stages: on:push
+          pull_image_and_stages: ${{ github.event_name != 'workflow_dispatch' }}
 
       - name: Run build
         run: |
-          docker run -v $(pwd):/usr/src/qgis qgis_server_deps /usr/src/qgis/.ci/ogc/build.sh
+          docker run -v $(pwd):/usr/src/qgis -v /home/runner/QGIS/.ccache:/root/.ccache ${DOCKER_IMAGE} /usr/src/qgis/.ci/ogc/build.sh
+        env:
+          DOCKER_IMAGE: ${{ steps.docker-build.outputs.FULL_IMAGE_NAME }}
 
       - name: Install pyogctest
         run: |