ci: add Linux host disk cleanup step for CI builds

Author: agneszitte

.github/actions/host-cleanup-linux/action.yml

@@ -0,0 +1,19 @@
+name: 'Host Cleanup (Linux)'
+description: 'Remove unused toolchains and SDKs to free disk space on Linux runners'
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Cleanup unused image dependencies
+      if: runner.os == 'Linux'
+      shell: bash
+      run: |
+        echo "Disk space before cleanup:"
+        df -h /
+        rm -fR ~/.cargo ~/.rustup ~/.dotnet
+        sudo rm -fR /usr/share/swift /opt/microsoft/msedge /usr/local/.ghcup /usr/lib/mono /usr/local/lib/android /opt/ghc /opt/hostedtoolcache/CodeQL
+        sudo snap remove lxd || true
+        sudo snap remove core20 || true
+        sudo apt remove -y snapd || true
+        echo "Disk space after cleanup:"
+        df -h /

.github/workflows/ci.yml

@@ -90,6 +90,9 @@ jobs:
       with:
         fetch-depth: 0
 
+    - name: Free disk space (Linux)
+      uses: ./.github/actions/host-cleanup-linux
+
     - name: Download Artifact
       uses: actions/download-artifact@v4
       with: