Improve build caching

.dockerignore

@@ -1,2 +1,4 @@
+.git
 Dockerfile
-**/README.md
+README.md
+/target/

.github/workflows/ci.yml

@@ -28,28 +28,17 @@ jobs:
           export DEBIAN_FRONTEND=noninteractive
           sudo apt-get clean && sudo apt-get update
           sudo apt-get install -y pkg-config  libudev-dev
-      - name: Cache cargo registry
-        uses: actions/cache@v1
+      - name: Cargo cache
+        uses: actions/cache@v2
         with:
-          path: ~/.cargo/registry
-          key: ${{ runner.os }}-cargo-registry-toolchain.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}
+          path: |
+            ~/.cargo/git
+            ~/.cargo/registry
+            ./target
+          key: ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
-            ${{ runner.os }}-cargo-registry-
-      - name: Cache cargo index
-        uses: actions/cache@v1
-        with:
-          path: ~/.cargo/git
-          key: ${{ runner.os }}-cargo-index-toolchain.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-cargo-index-
-      - name: Cache cargo build
-        uses: actions/cache@v1
-        with:
-          path: target
-          key: ${{ runner.os }}-cargo-build-target-${{ steps.rust-toolchain.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-cargo-build-target-${{ steps.rust-toolchain.outputs.rustc_hash }}-
-            ${{ runner.os }}-cargo-build-target-
+            ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.rustc_hash }}-
+            ${{ runner.os }}-cargo
       - name: Run tests
         uses: actions-rs/cargo@v1
         with:
@@ -73,30 +62,17 @@ jobs:
           export DEBIAN_FRONTEND=noninteractive
           sudo apt-get clean && sudo apt-get update
           sudo apt-get install -y pkg-config  libudev-dev
-      - name: Cache cargo registry
-        uses: actions/cache@v1
+      - name: Cargo cache
+        uses: actions/cache@v2
         with:
-          path: ~/.cargo/registry
-          key: ${{ runner.os }}-cargo-registry-${{ steps.rust-toolchain.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}
+          path: |
+            ~/.cargo/git
+            ~/.cargo/registry
+            ./target
+          key: ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
-            ${{ runner.os }}-cargo-registry-${{ steps.rust-toolchain.outputs.rustc_hash }}-
-            ${{ runner.os }}-cargo-registry-
-      - name: Cache cargo index
-        uses: actions/cache@v1
-        with:
-          path: ~/.cargo/git
-          key: ${{ runner.os }}-cargo-index-${{ steps.rust-toolchain.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-cargo-index-${{ steps.rust-toolchain.outputs.rustc_hash }}-
-            ${{ runner.os }}-cargo-index-
-      - name: Cache cargo build
-        uses: actions/cache@v1
-        with:
-          path: target
-          key: ${{ runner.os }}-cargo-build-target-${{ steps.rust-toolchain.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-cargo-build-target-${{ steps.rust-toolchain.outputs.rustc_hash }}-
-            ${{ runner.os }}-cargo-build-target-
+            ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.rustc_hash }}-
+            ${{ runner.os }}-cargo
       - name: Check rustfmt
         uses: actions-rs/cargo@v1
         with:
@@ -150,9 +126,16 @@ jobs:
         uses: actions/cache@v2
         with:
           path: |
+            ~/.cargo/git
             ~/.cargo/registry
             ./target
-          key: build-cargo-registry-${{matrix.TARGET}}
+          key: ${{ runner.os }}-cargo-${{matrix.TARGET}}-${{ steps.rust-toolchain.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-${{matrix.TARGET}}-${{ steps.rust-toolchain.outputs.rustc_hash }}
+            ${{ runner.os }}-cargo-${{matrix.TARGET}}-
+            ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}
+            ${{ runner.os }}-cargo-${{ steps.rust-toolchain.outputs.rustc_hash }}-
+            ${{ runner.os }}-cargo
       - name: Setup cross linux toolchain
         if: contains(matrix.TARGET, '-linux-') && !startsWith(matrix.TARGET, 'x86_64-')
         run: |
@@ -387,6 +370,8 @@ jobs:
           file: Dockerfile.alpine
           tags: ${{ steps.meta-alpine.outputs.tags }}
           labels: ${{ steps.meta-alpine.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
       - name: Build and push
         uses: docker/build-push-action@v3
         with:
@@ -397,4 +382,6 @@ jobs:
             linux/amd64
           push: true
           tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max