sonarcloud: free runner disk and drop debuginfo so the llvm-cov build fits (#76)

.github/workflows/sonarcloud.yml

@@ -61,6 +61,10 @@ jobs:
         uses: storytold/craft-common-actions/actions/checkout-craft-fonts@main
         with:
           ref: ${{ inputs.fonts-ref }}
+      - name: Free disk space
+        # The instrumented workspace build overflows the ~14 GB free on a stock runner.
+        if: steps.token.outputs.available == 'true' && hashFiles('Cargo.toml') != ''
+        run: sudo rm -rf /usr/share/dotnet /usr/local/lib/android /opt/ghc /opt/hostedtoolcache/CodeQL
       - name: Install Linux build dependencies
         if: steps.token.outputs.available == 'true' && hashFiles('Cargo.toml') != ''
         uses: storytold/craft-common-actions/actions/install-apt-packages@main
@@ -90,6 +94,8 @@ jobs:
         env:
           CARGO_TERM_COLOR: always
           CRAFT_FONTS_DIR: ${{ github.workspace }}/craft-fonts
+          # Coverage comes from instrumentation, not DWARF; debuginfo is most of target/.
+          CARGO_PROFILE_DEV_DEBUG: "0"
         run: >
           cargo llvm-cov --workspace --ignore-run-fail --lcov --output-path lcov.info
           --ignore-filename-regex '(^|/)(vendor|xtask)/'