put caching back

.github/workflows/rust.yml

@@ -8,6 +8,9 @@ on:
   pull_request:
     branches:
       - main
+env:
+  SCCACHE_GHA_ENABLED: "true"
+  RUSTC_WRAPPER: "sccache"
 
 jobs:
   build-mips:
@@ -21,6 +24,11 @@ jobs:
         uses: actions/checkout@v3
         with:
           lfs: true
+      - uses: Swatinem/rust-cache@v2
+      - name: Run sccache-cache
+        uses: mozilla-actions/[email protected]
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
       - name: Install development tools
         uses: taiki-e/[email protected]
         with:
@@ -52,6 +60,11 @@ jobs:
     steps:
       - name: Checkout Source
         uses: actions/checkout@v3
+      - uses: Swatinem/rust-cache@v2
+      - name: Run sccache-cache
+        uses: mozilla-actions/[email protected]
+        with: 
+          token: ${{ secrets.GITHUB_TOKEN }}
       - name: Setup protoc
         uses: arduino/[email protected]
       - uses: actions-rs/cargo@v1
@@ -63,6 +76,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+      - uses: Swatinem/rust-cache@v2
+      - name: Run sccache-cache
+        uses: mozilla-actions/[email protected]
+        with: 
+          token: ${{ secrets.GITHUB_TOKEN }}
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal