Add pipeline for deploy to new infra (#254)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
Adds a new GitHub Actions workflow (.github/workflows/deploy.yml) to
deploy to AWS ECS on pushes to main and release/pr-v* — it builds and
pushes a Docker image to ECR, updates the ECS task definition with the
new image, and deploys while waiting for service stability. The Railway
workflow’s push trigger is commented out, preserving manual
workflow_dispatch runs.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: a-nomad

.github/workflows/deploy.yml

@@ -0,0 +1,57 @@
+name: Deploy
+
+permissions:
+  id-token: write
+  contents: read
+
+on:
+  push:
+    branches:
+      - main
+      - 'release/pr-v*'
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    environment: ${{ (github.ref_name == 'main' && 'Development') || (startsWith(github.ref_name, 'release/pr-v') && 'Production') || 'None' }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: aws-actions/configure-aws-credentials@v4
+        with:
+          role-to-assume: ${{ vars.PIPELINE_ROLE_ARN }}
+          aws-region: ${{ vars.AWS_REGION }}
+
+      - uses: aws-actions/amazon-ecr-login@v2
+
+      - name: Build and push image
+        id: build
+        run: |
+          IMAGE_TAG=${{ github.sha }}
+          docker build -t ${{ vars.ECR_URL }}:$IMAGE_TAG .
+          docker push ${{ vars.ECR_URL }}:$IMAGE_TAG
+          echo "image=${{ vars.ECR_URL }}:$IMAGE_TAG" >> $GITHUB_OUTPUT
+
+      - name: Get current task definition
+        run: |
+          aws ecs describe-task-definition \
+            --task-definition ${{ vars.TASK_FAMILY }} \
+            --query taskDefinition \
+            > task-definition.json
+
+      - name: Update image in task definition
+        id: render
+        uses: aws-actions/amazon-ecs-render-task-definition@v1
+        with:
+          task-definition: task-definition.json
+          container-name: ${{ vars.CONTAINER_NAME }}
+          image: ${{ steps.build.outputs.image }}
+
+      - name: Deploy to ECS
+        uses: aws-actions/amazon-ecs-deploy-task-definition@v2
+        with:
+          task-definition: ${{ steps.render.outputs.task-definition }}
+          service: ${{ vars.ECS_SERVICE }}
+          cluster: ${{ vars.ECS_CLUSTER }}
+          wait-for-service-stability: true

.github/workflows/deploy_to_railway.yml

@@ -4,11 +4,11 @@ permissions:
   contents: read
 
 on:
-  push:
-    branches:
-      - main
-      - staging
-      - 'release/pr-v*'
+#   push:
+#     branches:
+#       # - main
+#       # - staging
+#       # - 'release/pr-v*'
 
   workflow_dispatch:
     inputs: