Github Actions: Add faster CI build for pull requests

Author: mbrossard

.github/workflows/linux.yml

@@ -4,10 +4,6 @@ on:
     branches:
       - main
       - develop
-  pull_request:
-    branches:
-      - main
-      - develop
   workflow_dispatch:
 
 jobs:

.github/workflows/pr.yml

@@ -0,0 +1,68 @@
+name: Build DAPLink PR (Linux)
+on:
+  pull_request:
+    branches:
+      - main
+      - develop
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        gcc: ['10.3-2021.10']
+
+    steps:
+    - name: Install Arm GNU Toolchain (arm-none-eabi-gcc)
+      uses: carlosperate/arm-none-eabi-gcc-action@v1
+      with:
+        release: ${{ matrix.gcc }}
+        path-env-var: ARM_NONE_EABI_GCC_PATH
+
+    - name: Cache Python modules
+      id: cache-python
+      uses: actions/cache@v3
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+        restore-keys: |
+          ${{ runner.os }}-pip-
+
+    - name: Checkout source files
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Install Python module
+      run:  |
+        pip3 install --user -r requirements.txt
+
+    - name: Install dependencies
+      run:  |
+        sudo apt install -y ccache ninja-build
+        arm-none-eabi-gcc -v | tee log.txt
+        (git status; git log -1)>> log.txt
+
+    - name: Cache CCache
+      id:   ccache
+      uses: actions/cache@v3
+      with:
+        path: .ccache
+        key: ${{ runner.os }}-gcc-${{ matrix.gcc }}-${{ hashFiles('log.txt') }}
+        restore-keys: |
+          ${{ runner.os }}-gcc-${{ matrix.gcc }}-
+
+    - name: Configure CCache
+      run:  |
+        ccache --set-config=cache_dir="$GITHUB_WORKSPACE/.ccache"
+        ccache --set-config=max_size=2Gi
+        ccache -s -z
+
+    - name: Compile
+      run:  |
+        export PATH="/usr/lib/ccache:$ARM_NONE_EABI_GCC_PATH:/home/runner/.local/bin:$PATH"
+        progen generate -t cmake_gcc_arm global_workspace
+        cmake -DCMAKE_C_COMPILER_LAUNCHER=ccache -GNinja -S projectfiles/cmake_gcc_arm -B projectfiles/cmake_gcc_arm
+        ninja -C projectfiles/cmake_gcc_arm
+        ccache -s