[chore](trx-rs): fix Rust PATH handling in CI

The Set up Rust step wrote the cargo bin dir to GITHUB_PATH, which does
not help within the same step and is not relied upon across steps on the
Gitea act_runner. Prepend $HOME/.cargo/bin to PATH directly in the setup
and each cargo step instead, so rustup and cargo resolve regardless of
GITHUB_PATH support.

Assisted-By: Claude Code (claude-opus-4)
Claude-Session: https://claude.ai/code/session_01NFpGtGTWUEYXLwZeZs2RAV
Signed-off-by: Stan Grams <sjg@haxx.space>

.gitea/workflows/ci.yml

@@ -27,10 +27,10 @@ jobs:
 
       - name: Set up Rust
         run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
           if ! command -v rustup >/dev/null 2>&1; then
             curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
               | sh -s -- -y --profile minimal
-            echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
           fi
           rustup toolchain install stable --profile minimal \
             --component rustfmt --component clippy
@@ -47,10 +47,14 @@ jobs:
           restore-keys: cargo-${{ runner.os }}-
 
       - name: rustfmt
-        run: cargo fmt --all -- --check
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          cargo fmt --all -- --check
 
       - name: clippy
-        run: cargo clippy --workspace --all-targets --all-features -- -D warnings
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          cargo clippy --workspace --all-targets --all-features -- -D warnings
 
   test:
     runs-on: ubuntu-latest
@@ -66,10 +70,10 @@ jobs:
 
       - name: Set up Rust
         run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
           if ! command -v rustup >/dev/null 2>&1; then
             curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
               | sh -s -- -y --profile minimal
-            echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
           fi
           rustup toolchain install stable --profile minimal
           rustup default stable
@@ -85,10 +89,14 @@ jobs:
           restore-keys: cargo-${{ runner.os }}-
 
       - name: Build
-        run: cargo build --workspace --all-targets --locked
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          cargo build --workspace --all-targets --locked
 
       - name: Test
-        run: cargo test --workspace --locked
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          cargo test --workspace --locked
 
   reuse:
     runs-on: ubuntu-latest