Optimize CI

.github/workflows/rust.yml

@@ -95,21 +95,24 @@ jobs:
       - uses: actions/checkout@v2
         with:
           submodules: true
-      - uses: actions-rs/toolchain@v1
+      - uses: actions/cache@v2
         with:
-          toolchain: stable
-      - name: cache
-        id: cache-target
-        uses: actions/cache@v2
-        with:
-          path: target
-          key: ${{ runner.os }}-${{ matrix.target }}
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ matrix.target }}-${{ hashFiles('**/Cargo.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-${{ matrix.target }}-
 
       # We have to append the "-D warnings" flag to .cargo/config rather than
       # using the RUSTFLAGS environment variable because if we set RUSTFLAGS
       # cargo will ignore the rustflags config in .cargo/config.
       - name: Check
         run: |
+          export CARGO_TARGET_DIR=$PWD/target
           mkdir -p .cargo
           echo -e '[target."cfg(all())"]\nrustflags = ["-D", "warnings"]' >> .cargo/config
           cd ${{ matrix.package }} && RUSTFLAGS=-Dwarnings cargo check --features=${{ matrix.features }} --target=${{ matrix.target }}
@@ -118,9 +121,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
       - name: Check fmt
         run: for i in embassy-*; do (cd $i; cargo fmt -- --check); done
 
@@ -128,11 +128,22 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
+      - uses: actions/cache@v2
         with:
-          toolchain: stable
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
       - name: Test
-        run: cd embassy && cargo test
+        run: |
+          export CARGO_TARGET_DIR=$PWD/target
+          cd embassy
+          cargo test
 
   metapac_gen:
     runs-on: ubuntu-latest
@@ -140,8 +151,19 @@ jobs:
       - uses: actions/checkout@v2
         with:
           submodules: true
-      - uses: actions-rs/toolchain@v1
+      - uses: actions/cache@v2
         with:
-          toolchain: stable
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
       - name: Generate pregenerated metapac
-        run: cd stm32-metapac-gen; cargo run --release
+        run: |
+          export CARGO_TARGET_DIR=$PWD/target
+          cd stm32-metapac-gen
+          cargo run --release