ci/cd: add separate worfklow for unit tests

.github/workflows/e2e-tests.yml

@@ -33,29 +33,6 @@ jobs:
           name: docker-image
           path: /tmp/docker-image.tar
 
-  test-backend:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-go@v5
-        with:
-          go-version-file: 'backend/go.mod'
-          cache-dependency-path: 'backend/go.sum'
-      - name: Install dependencies
-        working-directory: backend
-        run: |
-          go get ./...
-      - name: Run backend unit tests
-        working-directory: backend
-        run: |
-          go test -v ./... | tee /tmp/TestResults.log
-      - uses: actions/upload-artifact@v4
-        if: always()
-        with:
-          name: backend-unit-tests
-          path: /tmp/TestResults.log
-          retention-days: 15
-
   test-sqlite:
     runs-on: ubuntu-latest
     needs: build

.github/workflows/unit-tests.yml

@@ -0,0 +1,34 @@
+name: Unit Tests
+on:
+  push:
+    branches: [main]
+    paths: 
+      - "backend/**"
+  pull_request:
+    branches: [main]
+    paths: 
+      - "backend/**"
+
+jobs:
+  test-backend:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: 'backend/go.mod'
+          cache-dependency-path: 'backend/go.sum'
+      - name: Install dependencies
+        working-directory: backend
+        run: |
+          go get ./...
+      - name: Run backend unit tests
+        working-directory: backend
+        run: |
+          go test -v ./... | tee /tmp/TestResults.log
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: backend-unit-tests
+          path: /tmp/TestResults.log
+          retention-days: 15