fix(ci): use api/Dockerfile in build-and-push-api job

PR #111 fixed the build context to ./api but forgot to also update
the file path. The job was using ./Dockerfile (the frontend Dockerfile
which references nginx.conf and package-lock.json from the repo root),
causing the API image build to fail with a cache checksum error.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/ci.yml

@@ -334,7 +334,7 @@ jobs:
       - name: Build and push API Docker image
         uses: docker/build-push-action@v6
         with:
-          context: .
+          context: ./api
           file: ./api/Dockerfile
           push: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
           tags: ${{ steps.meta.outputs.tags }}
@@ -399,6 +399,7 @@ jobs:
           git config user.email "cartsnitch-ci[bot]@users.noreply.github.com"
           git add apps/overlays/dev/kustomization.yaml
           git commit -m "ci(dev): update cartsnitch, auth, receiptwitness, and api images"
+          git pull --rebase origin main
           git push origin main
 
   deploy-uat:
@@ -460,4 +461,5 @@ jobs:
           git config user.email "cartsnitch-ci[bot]@users.noreply.github.com"
           git add apps/overlays/uat/kustomization.yaml
           git commit -m "ci(uat): update cartsnitch, auth, receiptwitness, and api images"
+          git pull --rebase origin main
           git push origin main