Get branch name for passing to packer

Author: shub-kris

.github/workflows/build-ami.yml

@@ -55,17 +55,21 @@ jobs:
             run: packer init hcl2-files
             continue-on-error: true
 
+          - name: Determine Branch name
+            id: get-branch-name
+            run: 
+          
           - name: Packer Validate
             id: validate
-            # If the workflow is triggered manually or scheduled, uses the tag, otherwise uses the current branch for building the AMI  
-            run: packer validate -var "optimum_version=${{ github.event.inputs.tag || github.ref }}" -var "region=${{ env.AWS_REGION }}" hcl2-files
+            # If the workflow is triggered manually or scheduled, uses the tag, otherwise uses the name of branch that triggered worklfow for building the AMI  
+            run: packer validate -var "optimum_version=${{ github.event.inputs.tag || github.head_ref || github.ref_name }}" -var "region=${{ env.AWS_REGION }}" hcl2-files
             continue-on-error: true
 
           - name: Packer Build
             id: build
-            # If the workflow is triggered manually or scheduled, uses the tag, otherwise uses the current branch for building the AMI 
+            # If the workflow is triggered manually or scheduled, uses the tag, otherwise uses the name of branch that triggered worklfow for building the AMI 
             run:  | 
-              packer build -var "optimum_version=${{ github.event.inputs.tag || github.ref }}" -var "region=${{ env.AWS_REGION }}" hcl2-files              
+              packer build -var "optimum_version=${{ github.event.inputs.tag || github.head_ref || github.ref_name }}" -var "region=${{ env.AWS_REGION }}" hcl2-files              
 
           - name: Slack Notification on Failure
             id: slack