disable aws related steps if pr run (#85)

If a PR is created from a fork, then GitHub secrets are not available to
the fork (for security reasons). This will cause the AWS related steps
to fail.
So we should skip such steps that rely on the GH secret for PR workflow
runs.


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Author: srprash

.github/actions/artifacts_build/action.yml

@@ -44,6 +44,7 @@ runs:
         run_unit_tests: true
 
     - name: Configure AWS Credentials
+      if: inputs.push_image == true
       uses: aws-actions/configure-aws-credentials@v4
       with:
         role-to-assume: ${{ inputs.snapshot-ecr-role }}
@@ -65,6 +66,7 @@ runs:
       uses: docker/setup-buildx-action@v3
 
     - name: Login to AWS ECR
+      if: inputs.push_image == true
       uses: docker/login-action@v3
       with:
         registry: ${{ inputs.image_registry }}