Fix CI/CD pipeline to run on main branch merges

- Update build job to run on both main branch pushes and tags
- Update test and lint jobs to run on main branch pushes
- Only upload build artifacts when building from tags (for PyPI)
- Add version display step for debugging
- Install setuptools_scm in build dependencies

This ensures:
- Main branch merges trigger testing and building
- Only tagged releases are published to PyPI
- Development builds are tested but not published

Author: shashankmc

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ on:
 
 jobs:
   lint:
-    if: github.event_name == 'pull_request'
+    if: github.event_name == 'pull_request' || (github.event_name == 'push' && github.ref == 'refs/heads/main')
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repository
@@ -31,7 +31,7 @@ jobs:
 
   test:
     needs: lint
-    if: github.event_name == 'pull_request'
+    if: github.event_name == 'pull_request' || (github.event_name == 'push' && github.ref == 'refs/heads/main')
     name: Test on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     strategy:
@@ -65,7 +65,7 @@ jobs:
           pytest tests/ --doctest-modules --junitxml=junit/test-results.xml --cov=src/echr_extractor --cov-report=xml --cov-report=html
 
   build:
-    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
+    if: github.event_name == 'push' && (github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/'))
     name: Build Python package
     runs-on: ubuntu-latest
     steps:
@@ -78,13 +78,18 @@ jobs:
       - name: Install build dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install setuptools wheel build
+          pip install setuptools wheel build setuptools_scm
+
+      - name: Show version that will be built
+        run: |
+          python -c "import setuptools_scm; print('Version:', setuptools_scm.get_version())"
 
       - name: Build package
         run: |
           python -m build
 
       - name: Upload build artifacts
+        if: startsWith(github.ref, 'refs/tags/')
         uses: actions/upload-artifact@v4
         with:
           name: python-package-distributions