ci: cache per rust version

Author: phip1611

.github/workflows/_build-rust.yml

@@ -52,8 +52,8 @@ jobs:
             ~/.cargo/registry/cache/
             ~/.cargo/git/db/
             target/
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: ${{ runner.os }}-cargo-
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}-${{ inputs.rust-version }}
+          restore-keys: ${{ runner.os }}-cargo-${{ inputs.rust-version }}
       - run: cargo version
       - name: Code Formatting
         if: ${{ inputs.do-style-check }}

.github/workflows/rust.yml

@@ -16,60 +16,60 @@ env:
 
 jobs:
   build_multiboot2_msrv:
-    name: "build (msrv)"
+    name: build (msrv)
     uses: ./.github/workflows/_build-rust.yml
     with:
       rust-version: 1.56.1
       do-style-check: false
 
   build_multiboot2_stable:
-    name: "build (stable)"
+    name: build (stable)
     uses: ./.github/workflows/_build-rust.yml
     with:
       rust-version: stable
       do-style-check: false
 
   build_multiboot2_nightly:
-    name: "build (nightly)"
+    name: build (nightly)
     uses: ./.github/workflows/_build-rust.yml
     with:
       rust-version: nightly
       do-style-check: false
 
   build_nostd_multiboot2_msrv:
-    name: "build no_std (msrv)"
+    name: build no_std (msrv)
     uses: ./.github/workflows/_build-rust.yml
     with:
       rust-version: 1.56.1
       do-style-check: false
       rust-target: thumbv7em-none-eabihf
 
   build_nostd_multiboot2_stable:
-    name: "build no_std  (stable)"
+    name: build no_std (stable)
     uses: ./.github/workflows/_build-rust.yml
     with:
       rust-version: stable
       do-style-check: false
       rust-target: thumbv7em-none-eabihf
 
   build_nostd_multiboot2_nightly:
-    name: "build no_std  (nightly)"
+    name: build no_std (nightly)
     uses: ./.github/workflows/_build-rust.yml
     with:
       rust-version: nightly
       do-style-check: false
       rust-target: thumbv7em-none-eabihf
 
   style_multiboot2_msrv:
-    name: "style (msrv)"
+    name: style (msrv)
     uses: ./.github/workflows/_build-rust.yml
     with:
       rust-version: 1.56.1
       do-style-check: true
       do-test: false
 
   style_multiboot2_stable:
-    name: "style (stable)"
+    name: style (stable)
     uses: ./.github/workflows/_build-rust.yml
     with:
       rust-version: stable