added new ci workflow

.github/workflows/build-and-push-antithesis.yml

@@ -0,0 +1,66 @@
+name: Build docker images (Antithesis)
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'The docker image tag'
+        required: true
+  push:
+    branches:
+      - master
+    tags:
+      - "v[0-9]+.[0-9]+.[0-9]+"
+      - "v[0-9]+.[0-9]+.[0-9]+-[a-z]+"
+  pull_request:
+    branches:
+      - master
+
+env:
+  GIT_LFS_SKIP_SMUDGE: 1
+
+jobs:
+  docker:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v3
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          version: v0.9.1
+      - name: Login to private registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ secrets.ANTITHESIS_REGISTRY_URL }}
+          username: _json_key
+          password: ${{ secrets.ANTITHESIS_GAR_JSON_KEY }}
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ secrets.REGISTRY_URL }}/namada-scenario-tester
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=raw,value=latest
+      - name: Build and Push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: Dockerfile
+          push: ${{ github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/tags/v') }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+