fix: free disk space before Docker builds

Clears ~14GB by removing unused toolchains and pruning Docker before building API and sidecar images.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ritunjaym

.github/workflows/ci.yml

@@ -98,6 +98,12 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Free disk space
+        run: |
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /opt/ghc
+          docker system prune -af --volumes
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -123,6 +129,12 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Free disk space
+        run: |
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /opt/ghc
+          docker system prune -af --volumes
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3