ci: process both string and boolean values of inputs.publish

.github/workflows/build_and_push_docker_images.yaml

@@ -169,7 +169,7 @@ jobs:
 
     - uses: docker/build-push-action@v3
       with:
-        push: ${{ inputs.publish == 'true' || github.repository_owner != 'emqx' }}
+        push: ${{ inputs.publish == 'true' || inputs.publish || github.repository_owner != 'emqx' }}
         pull: true
         no-cache: true
         platforms: linux/amd64,linux/arm64

.github/workflows/build_packages.yaml

@@ -268,7 +268,7 @@ jobs:
     needs:
       - mac
       - linux
-    if: ${{ inputs.publish == 'true' }}
+    if: inputs.publish == 'true' || inputs.publish
     strategy:
       fail-fast: false
       matrix: