CI: Inject COMMIT file into archives when missing

This allows us to run js-benchmarks against older commits and have the
workflow correctly identify the commit used to build the binaries. In
order to actually build commits where the wasm binary was not yet built,
we have to account for missing archives as well.

.github/workflows/js-and-wasm-artifacts.yml

@@ -49,6 +49,12 @@ jobs:
         with:
           ref: ${{ inputs.reference_to_build }}
 
+      - name: 'Determine build commit hash'
+        id: build-commit
+        shell: bash
+        run: |
+          echo "sha=$(git rev-parse HEAD)" >> "${GITHUB_OUTPUT}"
+
       - name: "Set up environment"
         uses: ./.github/actions/setup
         with:
@@ -102,6 +108,17 @@ jobs:
         run: |
           cpack
 
+          # Inject the COMMIT file for older builds (before commit 5c5de0e30e04).
+          for package in ladybird-*.tar.gz; do
+            if ! tar -tzf "${package}" | grep -qx COMMIT; then
+              echo "${{ steps.build-commit.outputs.sha }}" > COMMIT
+              gunzip "${package}"
+              tar --append --file="${package%.gz}" COMMIT
+              gzip "${package%.gz}"
+              rm COMMIT
+            fi
+          done
+
       - name: Save Caches
         uses: ./.github/actions/cache-save
         with:
@@ -115,23 +132,27 @@ jobs:
       - name: Sanity-check the js repl
         shell: bash
         run: |
-          set -e
-          tar -xvzf Build/distribution/ladybird-js-${{ matrix.package_type }}.tar.gz
-          ./bin/js -c "console.log('Hello, World\!');" > js-repl-out.txt
-          if ! grep -q "\"Hello, World\!\"" js-repl-out.txt; then
+          path="Build/distribution/ladybird-js-${{ matrix.package_type }}.tar.gz"
+          if [ -f "${path}" ]; then
+            tar -xvzf "${path}"
+            bin/js -c "console.log('Hello, World\!');" > js-repl-out.txt
+            if ! grep -q "\"Hello, World\!\"" js-repl-out.txt; then
               echo "Sanity check failed: \"Hello, World\!\" not found in output."
               exit 1
+            fi
           fi
 
       - name: Sanity-check the wasm repl
         shell: bash
         run: |
-          set -e
-          tar -xvzf Build/distribution/ladybird-wasm-${{ matrix.package_type }}.tar.gz
-          ./bin/wasm -e run_sanity_check -w ${{ github.workspace }}/Libraries/LibWasm/Tests/CI/ci-sanity-check.wasm > wasm-repl-out.txt
-          if ! grep -q "Hello, World\!" wasm-repl-out.txt; then
+          path="Build/distribution/ladybird-wasm-${{ matrix.package_type }}.tar.gz"
+          if [ -f "${path}" ]; then
+            tar -xvzf "${path}"
+            bin/wasm -e run_sanity_check -w ${{ github.workspace }}/Libraries/LibWasm/Tests/CI/ci-sanity-check.wasm > wasm-repl-out.txt
+            if ! grep -q "Hello, World\!" wasm-repl-out.txt; then
               echo "Sanity check failed: Hello, World\! not found in output."
               exit 1
+            fi
           fi
 
       - name: Upload js package