chore: Clean up CI workflow by removing redundant Docker build steps

### Summary of Changes
- Removed unnecessary Docker build steps from the CI workflows for API Docs, API Gateway, and Frontend.
- Streamlined the build process by eliminating duplicate commands, enhancing clarity and maintainability.

### Expected Results
- Improved readability of CI configuration and reduced complexity in the build process, making it easier to manage and update in the future.

.gitea/workflows/api-docs.yml

@@ -200,7 +200,4 @@ jobs:
         echo "ESLint verified successfully"
       
     - name: Build application
-      run: npm run build
-      
-    - name: Build Docker image (test only)
-      run: docker build -t api-docs:test .
+      run: npm run build

.gitea/workflows/api-gateway.yml

@@ -153,7 +153,4 @@ jobs:
         
     - name: Build application
       run: ./mvnw clean package -DskipTests
-      
-    - name: Build Docker image (test only)
-      run: docker build -t api-gateway:test .
     

.gitea/workflows/frontend.yml

@@ -174,9 +174,6 @@ jobs:
       run: |
         echo "Build artifacts created in frontend/build/"
         echo "Build analysis available in pipeline logs"
-        
-    - name: Build Docker image (test only)
-      run: docker build -t frontend:test .
 
   lighthouse:
     runs-on: [self-hosted]

.gitea/workflows/service-adapters.yml

@@ -164,7 +164,4 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install -r requirements.txt
-        
-    - name: Build Docker image (test only)
-      run: docker build -t service-adapters:test .
+        pip install -r requirements.txt