Use prebuilt cargo Github action

This makes no difference right now but will make it easier to add
cross-compilation later as the cargo Github action has built-in support
for `cross`: https://github.com/actions-rs/cargo.

.github/workflows/release.yaml

@@ -20,7 +20,12 @@ jobs:
     - name: Use cache for Rust dependencies
       uses: Swatinem/rust-cache@v1
     - name: Build
-      run: cargo build --release && mv target/release/reshape ./reshape-linux_amd64
+      uses: actions-rs/cargo@v1
+      with:
+        command: build
+        args: --release
+    - name: Rename binary
+      run: mv target/release/reshape ./reshape-linux_amd64
     - name: Save binary to release
       uses: skx/github-action-publish-binaries@master
       env:

.github/workflows/test.yaml

@@ -37,6 +37,9 @@ jobs:
     - name: Use cache for Rust dependencies
       uses: Swatinem/rust-cache@v1
     - name: Run integration tests
-      run: cargo test -- --test-threads=1
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+        args: -- --test-threads=1
       env:
         POSTGRES_CONNECTION_STRING: "postgres://postgres:postgres@127.0.0.1/migra_test"