Attempt to free up more disk space on GitHub CI.

.github/workflows/docker.yml

@@ -13,9 +13,26 @@ jobs:
     steps:
       - name: Free up disk space
         run: |
-          sudo rm -rf /usr/share/dotnet /usr/local/lib/android/sdk/ndk /opt/ghc /usr/local/.ghcup /opt/hostedtoolcache/CodeQL
-          sudo docker image prune --all --force
+          # The build runs entirely inside the Docker container, which ships its
+          # own JDK, Android SDK, and NDK. None of the host toolchains are needed.
+          sudo rm -rf /usr/lib/jvm
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /usr/share/swift
+          sudo rm -rf /usr/local/.ghcup
+          sudo rm -rf /usr/local/julia*
+          sudo rm -rf /usr/local/lib/android
+          sudo rm -rf /usr/local/share/chromium
+          sudo rm -rf /opt/microsoft /opt/google
+          sudo rm -rf /opt/az
+          sudo rm -rf /usr/local/share/powershell
+          sudo rm -rf /opt/hostedtoolcache
+          docker system prune -af || true
+          docker builder prune -af || true
+      - name: Disk usage after cleanup
+        if: always()
+        run: |
           df -h
+          docker system df || true
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         # gh api repos/actions/checkout/commits/v6 --jq '.sha'
       - name: Set up Docker Buildx
@@ -28,5 +45,15 @@ jobs:
           load: true
           cache-from: type=gha
           cache-to: type=gha,mode=max
+      - name: Disk usage after image build
+        if: always()
+        run: |
+          df -h
+          docker system df || true
       - name: Test build
         run: docker run --memory=12g --rm -v "$(pwd)":/project -w /project signal-android ./gradlew --no-daemon --max-workers=1 -Dorg.gradle.jvmargs="-Xmx4g -XX:MaxMetaspaceSize=512m" -Dkotlin.compiler.execution.strategy=in-process bundlePlayProdRelease
+      - name: Disk usage after test build
+        if: always()
+        run: |
+          df -h
+          docker system df || true