Free disk space to stabilize the GitHub build of oak_client_android_app.

Individual steps will be reviewed for effectiveness; ineffective ones will be removed.

Bug: 352507636

Change-Id: Ifa4b80d497f047127527dfc356383c48780bac93

.github/workflows/build.yaml

@@ -55,6 +55,34 @@ jobs:
       - name: Mount main branch
         uses: actions/checkout@v4
 
+      # The runner comes with all this software pre-installed:
+      # https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2004-Readme.md
+      # To avoid failures due to lack of disk space, we delete some large packages
+      # which are irrelevant for building. Sources:
+      # https://github.com/jens-maus/RaspberryMatic/blob/ea6b8ce0dd2d53ea88b2766ba8d7f8e1d667281f/.github/workflows/ci.yml#L34-L40
+      # https://github.com/actions/runner-images/issues/2875
+      - name: Free disk space
+        run: |
+          df --human-readable
+          sudo apt-get remove --yes \
+              '^dotnet-.*' '^llvm-.*' 'php.*' azure-cli google-cloud-cli \
+              hhvm google-chrome-stable firefox powershell
+          df --human-readable
+          sudo apt-get autoremove --yes
+          df --human-readable
+          sudo apt clean
+          df --human-readable
+          docker rmi $(docker image ls --all --quiet)
+          df --human-readable
+          rm --recursive --force "${AGENT_TOOLSDIRECTORY}"
+          df --human-readable
+          rm --recursive --force /usr/local/share/boost
+          df --human-readable
+          sudo swapoff --all
+          df --human-readable
+          sudo rm --force /swapfile
+          df --human-readable
+
       # Keeps two versions of SUBJECT_PATHS, with space resp. comma as
       # path separator. Both are needed in later steps.
       - name: Parse buildconfig