use 'cargo test --workspace' in CI (#1793)

79caa7b72b setup helix-term as the
default workspace member (which I believe is done to avoid building
xtask on every compile). This changes the behavior of 'cargo test'
though so that it only runs helix-term tests by default. To run all
tests, we switch to 'cargo test --workspace'.

.github/workflows/build.yml

@@ -90,6 +90,7 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: test
+          args: --workspace
 
     strategy:
       matrix:

.github/workflows/release.yml

@@ -67,7 +67,7 @@ jobs:
         with:
           use-cross: ${{ matrix.cross }}
           command: test
-          args: --release --locked --target ${{ matrix.target }}
+          args: --release --locked --target ${{ matrix.target }} --workspace
 
       - name: Build release binary
         uses: actions-rs/cargo@v1