ci(gitea): unify push and merged-pr validation

.gitea/workflows/push-validation.yml

@@ -0,0 +1,27 @@
+name: Push Validation
+
+on:
+  push:
+    branches:
+      - "**"
+    tags-ignore:
+      - "*"
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Run full unit test suite
+        run: go test ./...
+
+      - name: Run behavior suite on main pushes
+        if: ${{ github.ref == 'refs/heads/main' }}
+        run: ./script/run-behavior-suite-docker.sh