Install protoc in CI

.github/workflows/CI.yml

@@ -12,13 +12,21 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - uses: dtolnay/rust-toolchain@stable
+    - name: Install protoc
+      uses: taiki-e/install-action@v2
+      with:
+        tool: [email protected]
     - run: cargo check --workspace --all-features --all-targets
 
   check-docs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
     - uses: dtolnay/rust-toolchain@stable
+    - name: Install protoc
+      uses: taiki-e/install-action@v2
+      with:
+        tool: [email protected]
     - name: cargo doc
       working-directory: ${{ matrix.subcrate }}
       env:
@@ -31,6 +39,10 @@ jobs:
     - uses: actions/checkout@v3
     - uses: dtolnay/rust-toolchain@stable
     - uses: taiki-e/install-action@cargo-hack
+    - name: Install protoc
+      uses: taiki-e/install-action@v2
+      with:
+        tool: [email protected]
     - name: cargo hack check
       working-directory: ${{ matrix.subcrate }}
       env:
@@ -49,6 +61,10 @@ jobs:
     - uses: dtolnay/rust-toolchain@master
       with:
         toolchain: ${{ matrix.rust }}
+    - name: Install protoc
+      uses: taiki-e/install-action@v2
+      with:
+        tool: [email protected]
     - run: cargo test --workspace --all-features
 
   test-msrv:
@@ -57,6 +73,10 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - uses: dtolnay/[email protected]
+    - name: Install protoc
+      uses: taiki-e/install-action@v2
+      with:
+        tool: [email protected]
     - run: cargo test -p tower-http --all-features
 
   style:
@@ -67,6 +87,10 @@ jobs:
     - uses: dtolnay/rust-toolchain@stable
       with:
         components: rustfmt
+    - name: Install protoc
+      uses: taiki-e/install-action@v2
+      with:
+        tool: [email protected]
     - run: cargo fmt --all --check
 
   deny-check: