Allow workflows to run on PRs (#147)

.github/workflows/build.yml

@@ -1,6 +1,11 @@
 name: build
 on:
+  pull_request:
   push:
+    tags:
+      - v*
+    branches:
+      - main
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.number || github.ref }}
@@ -32,14 +37,14 @@ jobs:
     name: Test
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-      with:
-        submodules: true
-        fetch-depth: 0
-    - uses: actions/setup-go@v4
-      with:
-        go-version-file: go.mod
-        check-latest: true
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+          fetch-depth: 0
+      - uses: actions/setup-go@v4
+        with:
+          go-version-file: go.mod
+          check-latest: true
 
-    - run: git config --global url.https://[email protected] https://github.com
-    - run: make test
+      - run: git config --global url.https://[email protected] https://github.com
+      - run: make test