github/workflows: Update tests workflow

Update target branch (master -> main).

.github/workflows/tests.yml

@@ -0,0 +1,44 @@
+name: Tests
+run-name: "${{ github.ref_name }}: Tests"
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    name: Go tests
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+        go:
+          - 1.18
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+
+      - name: Install Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.12
+
+      - name: Install virtualenv
+        run: |
+          pip install --upgrade virtualenv
+
+      - name: Run Go Tests
+        run: |
+          go test ./... -v