Fix to not specify the rust toolchain version everywhere (#5614)

* Fix to not specify the rust toolchain version everywhere

* Fix to source

* Fix warning about non-portable option to cp

* Fix to use built-in Swatinem/rust-cache

* Fix Swatinem/rust-cache to use the right directory

.github/workflows/cargo-check.yml

@@ -19,15 +19,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Install latest rust
-        uses: actions-rs/toolchain@v1
+      - name: Use correct Rust toolchain
+        shell: bash
+        run: |
+          cp --update=none rust/rust-toolchain.toml ./ || true
+      - name: Install rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
-            toolchain: 1.85
-            override: true
-            default: true
-
-      - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.6.1
+          cache-workspaces: rust
 
       - name: Run check
         run: |

.github/workflows/cargo-clippy.yml

@@ -26,16 +26,15 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: taiki-e/install-action@just
-      - name: Install latest rust
-        uses: actions-rs/toolchain@v1
+      - name: Use correct Rust toolchain
+        shell: bash
+        run: |
+          cp --update=none rust/rust-toolchain.toml ./ || true
+      - name: Install rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
-            toolchain: 1.85
-            override: true
-            default: true
-            components: clippy
-
-      - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.6.1
+          cache-workspaces: rust
+          components: clippy
 
       - name: Run clippy
         run: |

.github/workflows/cargo-fmt.yml

@@ -28,16 +28,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Install latest rust
-        uses: actions-rs/toolchain@v1
+      - name: Use correct Rust toolchain
+        shell: bash
+        run: |
+          cp --update=none rust/rust-toolchain.toml ./ || true
+      - name: Install rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
-            toolchain: 1.85
-            override: true
-            default: true
-            components: rustfmt
-
-      - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.6.1
+          cache-workspaces: rust
+          components: rustfmt
 
       - name: Run cargo fmt
         run: |

.github/workflows/cargo-test.yml

@@ -16,12 +16,14 @@ jobs:
     runs-on: ubuntu-latest-8-cores
     steps:
       - uses: actions/checkout@v4
-      - name: Install latest rust
-        uses: actions-rs/toolchain@v1
+      - name: Use correct Rust toolchain
+        shell: bash
+        run: |
+          cp --update=none rust/rust-toolchain.toml ./ || true
+      - name: Install rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
-          toolchain: 1.85
-          override: true
-          default: true
+          cache: false # Configured below.
       - name: Install vector
         run: |
           curl --proto '=https' --tlsv1.2 -sSfL https://sh.vector.dev > /tmp/vector.sh
@@ -40,6 +42,8 @@ jobs:
       - uses: taiki-e/install-action@nextest
       - name: Rust Cache
         uses: Swatinem/rust-cache@v2.6.1
+        with:
+          workspaces: rust
       - name: cargo test
         shell: bash
         run: |-