minor CI fixes

.github/actions/prepare-protobuf-cache/action.yml

@@ -1,8 +1,8 @@
 name: Prepare Protobuf Cache
-description: Restore or build the cached protobuf installation.
+description: Restore or build the cached Protobuf installation.
 
 inputs:
-  protobuf-commit:
+  protobuf-ref:
     description: Protobuf tag or commit to build.
     required: true
   mold-linker-flags:
@@ -12,20 +12,20 @@ inputs:
 runs:
   using: composite
   steps:
-    - name: Restore protobuf cache
+    - name: Restore Protobuf Cache
       id: restore-protobuf-cache
       uses: actions/cache/restore@v4
       with:
         path: |
           /usr/local/lib/libproto*
           /usr/local/include/google/protobuf
-        key: protobuf-${{ runner.os }}-${{ inputs.protobuf-commit }}
+        key: protobuf-${{ runner.os }}-${{ inputs.protobuf-ref }}
 
-    - name: Install protobuf
+    - name: Install Protobuf
       if: steps.restore-protobuf-cache.outputs.cache-hit != 'true'
       shell: bash
       run: |
-        git clone --depth 1 --branch ${{ inputs.protobuf-commit }} https://github.com/protocolbuffers/protobuf
+        git clone --depth 1 --branch ${{ inputs.protobuf-ref }} https://github.com/protocolbuffers/protobuf protobuf
         cmake -S protobuf -B protobuf/build -G Ninja \
           -DCMAKE_BUILD_TYPE=Release \
           -DCMAKE_EXE_LINKER_FLAGS="${{ inputs.mold-linker-flags }}" \
@@ -35,11 +35,11 @@ runs:
         sudo cmake --install protobuf/build
         rm -rf protobuf
 
-    - name: Save protobuf cache
+    - name: Save Protobuf Cache
       if: steps.restore-protobuf-cache.outputs.cache-hit != 'true'
       uses: actions/cache/save@v4
       with:
         path: |
           /usr/local/lib/libproto*
           /usr/local/include/google/protobuf
-        key: protobuf-${{ runner.os }}-${{ inputs.protobuf-commit }}
+        key: protobuf-${{ runner.os }}-${{ inputs.protobuf-ref }}