Resurrect the old CI

.github/workflows/build.yml

@@ -17,7 +17,6 @@ env:
 jobs:
   build:
     runs-on: ubuntu-latest
-    if: ${{ !startsWith(github.ref, 'refs/tags/') }}
     strategy:
       fail-fast: false
       matrix:
@@ -39,7 +38,6 @@ jobs:
 
   fmt:
     runs-on: ubuntu-latest
-    if: ${{ !startsWith(github.ref, 'refs/tags/') }}
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
@@ -50,8 +48,22 @@ jobs:
       - name: cargo fmt
         run: cargo fmt -- --check
 
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - run: cargo test
+
   publish:
     runs-on: ubuntu-latest
+    needs:
+      - build
+      - test
     if: ${{ startsWith(github.ref, 'refs/tags/') }}
     steps:
       - uses: actions/checkout@v2