Ruby: Try different workaround for Actions bug

.github/workflows/ruby-build.yml

@@ -262,29 +262,28 @@ jobs:
       - name: Fetch CodeQL
         uses: ./.github/actions/fetch-codeql
 
-      # Due to a bug in Actions, we can't use runner.temp here.
+      # Due to a bug in Actions, we can't use runner.temp in the run blocks here.
       # https://github.com/actions/runner/issues/2185
-      - name: Ensure temp directory exists
-        run: mkdir -p /tmp
 
       - name: Download Ruby bundle
         uses: actions/download-artifact@v3
         with:
           name: codeql-ruby-bundle
-          path: /tmp
+          path: ${{ runner.temp }}
       - name: Unzip Ruby bundle
         shell: bash
         run: unzip -q -d /tmp/ruby-bundle /tmp/codeql-ruby-bundle.zip
+        run: unzip -q -d "$RUNNER_TEMP"/ruby-bundle "$RUNNER_TEMP"/codeql-ruby-bundle.zip
 
       - name: Run QL test
         shell: bash
         run: |
-          codeql test run --search-path /tmp/ruby-bundle --additional-packs /tmp/ruby-bundle ruby/ql/test/library-tests/ast/constants/
+          codeql test run --search-path "$RUNNER_TEMP"/ruby-bundle --additional-packs "$RUNNER_TEMP"/ruby-bundle ruby/ql/test/library-tests/ast/constants/
       - name: Create database
         shell: bash
         run: |
-          codeql database create --search-path /tmp/ruby-bundle --language ruby --source-root ruby/ql/test/library-tests/ast/constants/ ../database
+          codeql database create --search-path "$RUNNER_TEMP"/ruby-bundle --language ruby --source-root ruby/ql/test/library-tests/ast/constants/ ../database
       - name: Analyze database
         shell: bash
         run: |
-          codeql database analyze --search-path /tmp/ruby-bundle --format=sarifv2.1.0 --output=out.sarif ../database ruby-code-scanning.qls
+          codeql database analyze --search-path "$RUNNER_TEMP"/ruby-bundle --format=sarifv2.1.0 --output=out.sarif ../database ruby-code-scanning.qls