Try removing ghcup caches

Author: fendor

.github/actions/setup-build/action.yml

@@ -116,3 +116,15 @@ runs:
     - name: "Remove freeze file"
       run: rm -f cabal.project.freeze
       shell: bash
+
+    - name: "How big is ghcup cache?"
+      if: runner.os == 'Linux'
+      run: |
+          df -h /
+          du -sh /home/runner/*
+      shell: bash
+
+    - name: "Remove ghcup caches"
+      if: runner.os == 'Linux'
+      run: ghcup gc --ghc-old --share-dir --hls-no-ghc --cache --tmpdirs --unset
+      shell: bash