Stop operator image build from being triggered automatically

The release process for the operator may require us to decouple
the bundle build+push and image build+push. This commit makes
it so that we will manually have to trigger the image build
github action.

Signed-off-by: Anish Asthana <anishasthana1@gmail.com>

Author: anishasthana

.github/workflows/operator-image.yml

@@ -4,9 +4,11 @@ name: Operator Image
 
 on:
   workflow_dispatch:
-  push:
-    tags:
-      - "*"
+    inputs:
+      tag:
+        description: 'Tag to be used for operator image'
+        required: true
+        default: 'unstable'
 
 jobs:
   push:
@@ -22,12 +24,6 @@ jobs:
         curl -LO ${OPERATOR_SDK_DL_URL}/operator-sdk_${OS}_${ARCH}
         chmod +x operator-sdk_${OS}_${ARCH} && sudo mv operator-sdk_${OS}_${ARCH} /usr/local/bin/operator-sdk
 
-
-    - name: Grab New Version Tag
-      id: tag_name
-      run: |
-        echo ::set-output name=SOURCE_TAG::${GITHUB_REF#refs/tags/}
-
     - name: Login to Quay.io
       uses: redhat-actions/podman-login@v1
       with:
@@ -49,11 +45,11 @@ jobs:
         make image-build -e IMG=quay.io/project-codeflare/codeflare-operator:${SOURCE_TAG}
         podman tag quay.io/project-codeflare/codeflare-operator:${SOURCE_TAG} quay.io/project-codeflare/codeflare-operator:latest
       env:
-        SOURCE_TAG: ${{ steps.tag_name.outputs.SOURCE_TAG }}
+        SOURCE_TAG: ${{ github.event.inputs.tags }}
 
     - name: Image Push
       run: |
         make image-push -e IMG=quay.io/project-codeflare/codeflare-operator:${SOURCE_TAG}
         make image-push -e IMG=quay.io/project-codeflare/codeflare-operator:latest
       env:
-        SOURCE_TAG: ${{ steps.tag_name.outputs.SOURCE_TAG }}
+        SOURCE_TAG: ${{ github.event.inputs.tags }}