chore(relayer): restore relayer CI (#1192)

- Add rust-toolchain.toml to dependency analysis
- Add rust-toolchain.toml to unit tests

Author: paulo-zama

.github/workflows/relayer-dependency-analysis.yml

@@ -44,10 +44,11 @@ jobs:
         with:
           persist-credentials: 'false'
 
+      - name: Setup Rust toolchain file
+        run: cp relayer/rust-toolchain.toml .
+
       - name: Rust setup
-        uses: dtolnay/rust-toolchain@a54c7afa936fefeb4456b2dd8068152669aa8203 # v1
-        with:
-          toolchain: stable
+        uses: dsherret/rust-toolchain-file@3551321aa44dd44a0393eb3b6bdfbc5d25ecf621 # v1
 
       - name: Install cargo-binstall
         uses: cargo-bins/cargo-binstall@84ca29d5c1719e79e23b6af147555a8f4dac79d6 # v1.10.14

.github/workflows/relayer-tests.yaml

@@ -48,11 +48,11 @@ jobs:
           token: ${{ secrets.BLOCKCHAIN_ACTIONS_TOKEN }}
           submodules: recursive
 
-      - name: Setup Rust
-        uses: dtolnay/rust-toolchain@a54c7afa936fefeb4456b2dd8068152669aa8203 # v1
-        with:
-          toolchain: stable
-          components: rustfmt
+      - name: Setup Rust toolchain file
+        run: cp relayer/rust-toolchain.toml .
+
+      - name: Rust setup
+        uses: dsherret/rust-toolchain-file@3551321aa44dd44a0393eb3b6bdfbc5d25ecf621 # v1
 
       - name: Cache Rust dependencies and build artifacts
         uses: Swatinem/rust-cache@779680da715d629ac1d338a641029a2f4372abb5 # v2.8.2