ci: be more limited with CARGO_TARGET_DIR

.github/workflows/check.yml

@@ -7,8 +7,6 @@ jobs:
   fast-test:
     name: Fast test
     runs-on: ubuntu-20.04
-    env:
-      CARGO_TARGET_DIR: "/tmp/cargo-install-target-dir"
     steps:
       - name: Checkout sources
         uses: actions/checkout@v4
@@ -19,7 +17,6 @@ jobs:
             ~/.cargo/registry
             ~/.cargo/git
             target
-            /tmp/cargo-install-target-dir
           key: fast-test-${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master
@@ -35,8 +32,6 @@ jobs:
     needs: fast-test
     name: Test main target
     runs-on: ubuntu-20.04
-    env:
-      CARGO_TARGET_DIR: "/tmp/cargo-install-target-dir"
     steps:
       - name: Checkout sources
         uses: actions/checkout@v4
@@ -63,7 +58,7 @@ jobs:
           cache-dependency-path: compile_assets/yarn.lock
       - name: Install additional test dependencies
         env:
-          CARGO_TARGET_DIR: cargo_target
+          CARGO_TARGET_DIR: "/tmp/cargo-install-target-dir"
         run: ./scripts/install
       - name: Run check script
         run: ./scripts/check
@@ -99,8 +94,6 @@ jobs:
             experimental: false
     runs-on: ${{ matrix.os }}
     continue-on-error: ${{ matrix.experimental }}
-    env:
-      CARGO_TARGET_DIR: "/tmp/cargo-install-target-dir"
     steps:
       # This is required, otherwise we get files with CRLF on Windows
       # Which causes tests relying on data loaded from files to fail
@@ -117,7 +110,6 @@ jobs:
             ~/.cargo/registry
             ~/.cargo/git
             target
-            /tmp/cargo-install-target-dir
           key: test-${{ matrix.os }}-${{ matrix.rust }}-cargo-${{ hashFiles('**/Cargo.toml') }}
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master

.github/workflows/deploy.yml

@@ -37,8 +37,6 @@ jobs:
             os: windows-latest
             name: x86_64-pc-windows-msvc.zip
     runs-on: ${{ matrix.os }}
-    env:
-      CARGO_TARGET_DIR: "/tmp/cargo-install-target-dir"
     steps:
       - name: Setup | Checkout
         uses: actions/checkout@v4
@@ -47,10 +45,11 @@ jobs:
       - name: Setup | Cache Cargo
         uses: actions/cache@v4
         with:
+          # Note that we don't cache the `target` directory here
+          # so we do a completely clean rebuild for artefacts
           path: |
             ~/.cargo/registry
             ~/.cargo/git
-            /tmp/cargo-install-target-dir
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
       - name: Setup | Rust
@@ -134,7 +133,6 @@ jobs:
     needs: github_release
     runs-on: ubuntu-20.04
     env:
-      CARGO_TARGET_DIR: "/tmp/cargo-install-target-dir"
     steps:
       - uses: actions/checkout@v4
       - uses: actions/cache@v4
@@ -144,7 +142,6 @@ jobs:
             ~/.cargo/git
             target
             ~/.cargo/bin
-            /tmp/cargo-install-target-dir
           # We reuse the cache from our detailed test environment, if available
           key: detailed-test-${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
       - name: Install toolchain

.github/workflows/docs.yml

@@ -12,8 +12,6 @@ permissions:
 jobs:
   publish:
     runs-on: ubuntu-20.04
-    env:
-      CARGO_TARGET_DIR: "/tmp/cargo-install-target-dir"
     steps:
       - uses: actions/checkout@v4
       - uses: actions/cache@v4
@@ -31,8 +29,12 @@ jobs:
         with:
           toolchain: stable
       - name: Install mdbook
+        env:
+          CARGO_TARGET_DIR: "/tmp/cargo-install-target-dir"
         run: ./scripts/install-mdbook
       - name: Install mdbook extras
+        env:
+          CARGO_TARGET_DIR: "/tmp/cargo-install-target-dir"
         run: ./book/scripts/install-mdbook-extras
       - name: Build book
         run: ./scripts/build-book