fix(ci): use /mnt for temporary files and dune cache

Should have more disk space.

Signed-off-by: Edwin Török <[email protected]>

.github/workflows/main.yml

@@ -122,6 +122,16 @@ jobs:
       - name: Update Ubuntu repositories
         run: sudo apt-get update
 
+      - name: Use disk with more space for TMPDIR and XDG_CACHE_HOME
+        run: |
+          df -h || true
+          export TMPDIR="/mnt/build/tmp"
+          export XDG_CACHE_HOME="/mnt/build/cache"
+          sudo mkdir -p "${TMPDIR}" "${XDG_CACHE_HOME}"
+          sudo chown "$(id -u):$(id -g)" "${TMPDIR}" "${XDG_CACHE_HOME}"
+          echo "TMPDIR=${TMPDIR}" >>"$GITHUB_ENV"
+          echo "XDG_CACHE_HOME=${XDG_CACHE_HOME}" >>"$GITHUB_ENV"
+                        
       - name: Use ocaml
         uses: ocaml/setup-ocaml@v2
         with: