Add image push action to the CI

.github/workflows/image-push.yaml

@@ -0,0 +1,43 @@
+name: Build and Push Pyth Agent Image
+on:
+  push:
+    tags:
+      - v*
+  workflow_dispatch:
+    inputs:
+      dispatch_description:
+        description: "Dispatch description"
+        required: true
+        type: string
+jobs:
+  agent-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      contents: read
+    steps:
+      - uses: actions/checkout@v2
+      - uses: aws-actions/configure-aws-credentials@8a84b07f2009032ade05a88a28750d733cc30db1
+        with:
+          role-to-assume: arn:aws:iam::192824654885:role/github-actions-ecr
+          aws-region: eu-west-2
+      - uses: docker/login-action@v2
+        with:
+          registry: public.ecr.aws
+        env:
+          AWS_REGION: us-east-1
+      - run: docker context create builders
+      - uses: docker/setup-buildx-action@v2
+        with:
+          version: latest
+          endpoint: builders
+      - uses: haya14busa/action-cond@v1
+        id: image_tag
+        with:
+          cond: ${{ startsWith(github.ref, 'refs/tags/') }}
+          if_true: ${{ github.ref_name }}
+          if_false: ${{ github.sha }}
+      - uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: public.ecr.aws/pyth-network/agent:${{ steps.image_tag.outputs.value }}