build(docker): free additional space on runners (#1450)

.github/workflows/ci-docker.yml

@@ -192,6 +192,16 @@ jobs:
     name: Docker${{ matrix.tag }}
 
     steps:
+      - name: Maximize build space
+        uses: easimon/maximize-build-space@v7
+        with:
+          root-reserve-mb: 30720  # https://github.com/easimon/maximize-build-space#caveats
+          remove-dotnet: 'true'
+          remove-android: 'true'
+          remove-haskell: 'true'
+          remove-codeql: 'true'
+          remove-docker-images: 'true'
+
       - name: Checkout
         uses: actions/checkout@v3
         with: