Try using a matrix to run workflows in parallel

.gitea/workflows/build.yaml

@@ -3,15 +3,16 @@ on: [push]
 
 jobs:
   build:
+    strategy:
+      matrix:
+        feature:
+          - tcp
+          - unix
     runs-on: nix
     steps:
       - name: Checkout
         uses: actions/checkout@v3
-      - name: Run clippy (tcp feature)
-        run: nix develop . -c cargo clippy --no-default-features --features tcp
-      - name: Run clippy (unix feature)
-        run: nix develop . -c cargo clippy --no-default-features --features unix
-      - name: Build & test (tcp feature)
-        run: nix build .#tcp
-      - name: Build & test (unix feature)
-        run: nix build .#unix
+      - name: Run clippy
+        run: nix develop . -c cargo clippy --no-default-features --features ${{ matrix.feature }}
+      - name: Build & test
+        run: nix build .#${{ matrix.feature }}