feat(github): Add new workflow files

.github/workflows/branch_ci.yml

@@ -1,10 +1,11 @@
 # Workflow that runs on pushes to non-default branches
 
-name: Non-Default Branch CI (Python)
+name: Non-Default Branch Push CI (Python)
 
 on:
   push:
-    branches-ignore: ["main"]
+    branches-ignore: ['main']
+    paths-ignore: ['README.md']
 
 # Specify concurrency such that only one workflow can run at a time
 # * Different workflow files are not affected
@@ -24,6 +25,7 @@ permissions:
 
 jobs:
 
+  # Job to run a linter and typechecker against the codebase
   lint-typecheck:
     runs-on: ubuntu-latest
 
@@ -51,6 +53,8 @@ jobs:
       - name: Typecheck package
         run: uv run mypy .
 
+  # Job to run unittests
+  # * Produces a JUnit XML report that can be displayed in the GitHub UI
   test-unit:
     runs-on: ubuntu-latest
     needs: lint-typecheck
@@ -119,8 +123,9 @@ jobs:
           name: docs
           path: docs
 
+  # Job for building container image
   # * Builds and pushes an OCI Container image to the registry defined in the environment variables
-  # * Only runs if test job passes
+  # * Only runs if test and lint jobs pass
   build-container:
     runs-on: ubuntu-latest
     permissions:
@@ -153,8 +158,7 @@ jobs:
         uses: docker/metadata-action@v5
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-          tags: |
-            type=ref,event=branch
+          tags: type=ref,event=branch
 
       # Build and push the Container image to the registry
       # * Creates a multiplatform-aware image

.github/workflows/main_ci.yml

@@ -0,0 +1,36 @@
+# Workflow that runs on closed PRs to the default branch
+
+name: Default Branch PR Merged CI (Python)
+
+on:
+  pull_request:
+    types: ["closed"]
+    branches: ["main"]
+
+# Specify concurrency such that only one workflow can run at a time
+# * Different workflow files are not affected
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: false
+
+
+jobs:
+
+  # Define an autotagger job that creates tags on changes to master
+  tag:
+    runs-on: ubuntu-latest
+    if: |
+      github.event_name == 'pull_request' && 
+      github.event.action == 'closed' && 
+      github.event.pull_request.merged == true
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Bump version and push tag
+        uses: RueLaLa/auto-tagger@v2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_PR_NUMBER: ${{ github.event.number }}