Added buildcache for Ubuntu ARM.

.github/workflows/cd.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   doxygen:
     name: Doxygen
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     env:
       BUILDCACHE_ACCURACY: STRICT
       BUILDCACHE_COMPRESS_FORMAT: ZSTD
@@ -41,7 +41,7 @@ jobs:
           path: ${{github.workspace}}/doxygen.tar.gz
   llvm-clang:
     name: LLVM+Clang tools
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     env:
       BUILDCACHE_ACCURACY: STRICT
       BUILDCACHE_COMPRESS_FORMAT: ZSTD
@@ -78,3 +78,26 @@ jobs:
         with:
           name: LLVM+Clang tools
           path: ${{github.workspace}}/clang*.tar.gz
+  buildcache:
+    name: buildcache
+    runs-on: ubuntu-22.04-arm
+    env:
+      BUILDCACHE_VERSION: 0.31.3
+    steps:
+      - name: Install CMake and Ninja
+        uses: lukka/get-cmake@latest
+      - name: Build buildcache
+        run: |
+          wget https://gitlab.com/bits-n-bites/buildcache/-/archive/v${BUILDCACHE_VERSION}/buildcache-v${BUILDCACHE_VERSION}.tar.gz -O - | tar -xz
+          cd buildcache-v${BUILDCACHE_VERSION}
+          mkdir build
+          cd build
+          cmake -G Ninja -DCMAKE_BUILD_TYPE=Release ../src
+          ninja
+          tar -cz buildcache -f ${{github.workspace}}/buildcache.tar.gz
+          ls -lh ${{github.workspace}}
+      - name: Upload buildcache artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: buildcache
+          path: ${{github.workspace}}/buildcache.tar.gz

README.rst

@@ -1,7 +1,8 @@
-This repository is used to build the various tools used by our GitHub Actions jobs on Ubuntu, which are:
+This repository is used to build the various tools used by our GitHub Actions jobs on Ubuntu 22.04 Intel and Ubuntu 22.04 ARM, which are:
 
-- `Doxygen <https://doxygen.nl/>`__; and some
-- `LLVM <https://llvm.org/>`__\ +\ `Clang <https://clang.llvm.org/>`__ tools.
+- `Doxygen <https://doxygen.nl/>`__ (Intel);
+- some `LLVM <https://llvm.org/>`__\ +\ `Clang <https://clang.llvm.org/>`__ tools (Intel); and
+- `buildcache <https://gitlab.com/bits-n-bites/buildcache>`__ (ARM).
 
 These tools are automatically built and uploaded as artifacts upon pushing to this repository.
 See `here <https://github.com/opencor/gha/blob/master/.github/workflows/cd.yml>`__ for the version of these tools.