fix: add ~/.cargo/bin to PATH for inline rustup run steps

The act runner uses a minimal PATH for inline run: steps that does not
include ~/.cargo/bin. Add it explicitly via both export PATH and
GITHUB_PATH so rustup/cargo are available in the setup step and all
subsequent steps.

.gitea/workflows/build-and-deploy.yaml

@@ -21,10 +21,10 @@ jobs:
 
       - name: Set up Rust toolchain
         run: |
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+          export PATH="$HOME/.cargo/bin:$PATH"
           rustup update stable
           rustup default stable
-        env:
-          RUSTFLAGS: -D warnings
 
       - name: Run tests
         run: cargo test --all-targets --all-features
@@ -40,6 +40,8 @@ jobs:
 
       - name: Set up Rust toolchain
         run: |
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+          export PATH="$HOME/.cargo/bin:$PATH"
           rustup update stable
           rustup default stable
           rustup component add rustfmt clippy