gha: Free up Github runner disk space

We are having the below failure due to no disk space, it seems like we
can remove pre-installed software and language runtimes, which are not
use in Cilium, to reclaim more disk space.

Alternative option is to bump the runner, but it might not be the best
resource and cost utilization.

Relates: https://github.com/cilium/cilium/actions/runs/10300396788
Relates: actions/runner-images#2840 (comment)
Signed-off-by: Tam Mach <[email protected]>

.github/actions/disk-cleanup/action.yaml

@@ -0,0 +1,28 @@
+name: Disk cleanup
+description: "Cleanup disk space"
+runs:
+  using: composite
+  steps:
+    - name: Free up disk space
+      shell: bash
+      run: |
+        echo "Disk space before cleanup..."
+        df -h /
+        echo "Removing unnecessary files to free up disk space..."
+        # https://github.com/actions/runner-images/issues/2840#issuecomment-2272410832
+        sudo rm -rf \
+          /opt/hostedtoolcache \
+          /opt/google/chrome \
+          /opt/microsoft/msedge \
+          /opt/microsoft/powershell \
+          /opt/pipx \
+          /usr/lib/mono \
+          /usr/local/julia* \
+          /usr/local/lib/android \
+          /usr/local/lib/node_modules \
+          /usr/local/share/chromium \
+          /usr/local/share/powershell \
+          /usr/share/dotnet \
+          /usr/share/swift
+        echo "Disk space after cleanup..."
+        df -h /

.github/workflows/integration-test.yaml

@@ -122,6 +122,9 @@ jobs:
           ref: ${{ inputs.context-ref || github.sha }}
           persist-credentials: false
 
+      - name: Cleanup Disk space in runner
+        uses: ./.github/actions/disk-cleanup
+
       - name: Set Environment Variables
         uses: ./.github/actions/set-env-variables