chore: Adding new github actions workflow for pushing containers (#160)

Adding a new github actions workflow to deploy containers in a more secure manner (using workload identity federation).

.github/workflows/docker_push_oidc.yaml

@@ -0,0 +1,22 @@
+name: Docker Push OIDC
+
+on:
+  workflow_dispatch:
+    inputs:
+    build_env:
+      description: 'Build environment (staging|production)'
+      required: true
+      default: 'staging'
+      type: string
+
+jobs:
+  Build-Celo-Oracle:
+    uses: celo-org/reusable-workflows/.github/workflows/[email protected]
+    with:
+      workload-id-provider: projects/1094498259535/locations/global/workloadIdentityPools/gh-celo-oracle/providers/github-by-repos
+      service-account: '[email protected]'
+      artifact-registry: us-west1-docker.pkg.dev/devopsre/celo-oracle/celo-oracle
+      tag: ${{ inputs.build_env }}
+      context: .
+      trivy: true
+      trivy-timeout: 40m