ci: build groups workflow

.github/workflows/build_all_targets.yml

@@ -0,0 +1,62 @@
+name: Build all targets
+
+on:
+  push:
+    branches:
+    - 'mrpollo/ci_runner_groups'
+
+jobs:
+  group_targets:
+    runs-on: ubuntu-latest
+    container: px4io/px4-dev-base-focal:2021-09-08
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+    steps:
+    - uses: actions/checkout@v1
+      with:
+        token: ${{ secrets.ACCESS_TOKEN }}
+    - id: set-matrix
+      run: echo "::set-output name=matrix::$(./Tools/generate_board_targets_json.py --group)"
+
+  setup:
+    runs-on: ubuntu-latest
+    needs: group_targets
+    strategy:
+      matrix: ${{ fromJson(needs.group_targets.outputs.matrix) }}
+    container: ${{ matrix.container }}
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          token: ${{ secrets.ACCESS_TOKEN }}
+      - name: ownership workaround
+        run: git config --system --add safe.directory '*'
+      - name: ccache setup timestamp
+        id: ccache_cache_timestamp
+        shell: cmake -P {0}
+        run: |
+          string(TIMESTAMP current_date "%Y-%m-%d-%H;%M;%S" UTC)
+          message("::set-output name=timestamp::${current_date}")
+      - name: ccache setup keys
+        uses: actions/cache@v2
+        with:
+          path: ~/.ccache
+          key: ${{ matrix.arch }}-ccache-${{ steps.ccache_cache_timestamp.outputs.timestamp }}
+          restore-keys: ${{ matrix.arch }}-ccache-
+      - name: setup ccache
+        run: |
+            mkdir -p ~/.ccache
+            echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
+            echo "compression = true" >> ~/.ccache/ccache.conf
+            echo "compression_level = 6" >> ~/.ccache/ccache.conf
+            echo "max_size = 120M" >> ~/.ccache/ccache.conf
+            echo "hash_dir = false" >> ~/.ccache/ccache.conf
+            ccache -s
+            ccache -z
+      - name: build target group
+        run: |
+          for target in ${matrix.targets//,/ }
+          do
+              make $target
+          done
+      - name: ccache post-run
+        run: ccache -s