Updated CI to push image on merge (#105)

Signed-off-by: Chaitanya Kulkarni <chkulkar@redhat.com>

Author: chaitanya1731

.github/workflows/maas-api-ci.yml

@@ -1,6 +1,9 @@
 name: MaaS API
 
 on:
+  push:
+    branches:
+      - main
   pull_request:
     paths:
       - 'maas-api/**'
@@ -39,4 +42,15 @@ jobs:
 
       - name: Build image
         run: make build-image
-
+      
+      - name: Login to Quay.io
+        if: github.event_name == 'push'
+        uses: docker/login-action@v3
+        with:
+          registry: quay.io
+          username: ${{ secrets.APP_QUAY_USERNAME }}
+          password: ${{ secrets.APP_QUAY_TOKEN }}
+      
+      - name: Push image to Quay.io
+        if: github.event_name == 'push'
+        run: make push-image