Fix errors finding Rust toolchain (#3802)

* switch to dtolnay/toolchain
* Add .dockerignore to avoid copying target/ into images
* update corrosion

.github/workflows/release-check.yaml

@@ -6,16 +6,14 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - uses: dtolnay/rust-toolchain@stable
+        id: toolchain
+
       - name: Cache cargo registry
         uses: actions/cache@v4
         with:
           path: ~/.cargo/registry
-          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
-
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: "stable"
-          override: true
+          key: ${{ runner.os }}-cargo-registry-${{ steps.toolchain.outputs.cachekey }}-${{ hashFiles('**/Cargo.lock') }}
 
       - name: Install uuid-dev
         run: sudo apt install uuid-dev