Use shared pipeline to release docker image (#64)

* Use shared pipeline to release docker image

* Remove `pull_request` workflow

* Use v2 of the shared pipeline

.github/workflows/release-docker-image.yaml

@@ -0,0 +1,21 @@
+name: Release UID2 Optout Image
+run-name: ${{ inputs.release_type == 'Snapshot' && 'Publish Pre-release' || format('Release {0}', inputs.release_type)}} Docker Image by @${{ github.actor }}  
+on:
+  workflow_dispatch:
+    inputs:
+      release_type:
+        type: choice
+        description: 'The type of release'
+        options:
+        - Major
+        - Minor
+        - Patch
+        - Snapshot
+
+jobs:
+  Image:
+    uses: IABTechLab/uid2-shared-actions/.github/workflows/shared-publish-docker-versioned.yaml@v2
+    with: 
+      release_type: ${{ inputs.release_type }}
+      cloud_provider: 'default'
+    secrets: inherit