Fix build-push-action condition (#790)

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------------------------------------------------------------------------------------------------------------

**Context:**
Two steps of the Docker build (building and pushing <version> and
`latest` to DH) should be skipped if the `push-to-dockerhub` value is
`false`, and the condition is broken (always skip).

**Description of the Change:**
Fix the condition.

**Benefits:**

**Possible Drawbacks:**

**Related GitHub Issues:**

---------

Co-authored-by: ringo-but-quantum <[email protected]>

Author: vincentmr

.github/CHANGELOG.md

@@ -8,13 +8,17 @@
   [(#788)](https://github.com/PennyLaneAI/pennylane-lightning/pull/788)
 
 ### Improvements
+
 * Add a Catalyst-specific wrapping class for Lightning Kokkos.
   [(#770)](https://github.com/PennyLaneAI/pennylane-lightning/pull/770)
 
 ### Documentation
 
 ### Bug fixes
 
+* Fix conditions for skipping build & push steps in the Docker build workflows.
+  [(#790)](https://github.com/PennyLaneAI/pennylane-lightning/pull/790)
+
 * Downgrade Scipy on Lightning stable version tests.
   [(#783)](https://github.com/PennyLaneAI/pennylane-lightning/pull/783)
 

.github/workflows/docker_linux_x86_64.yml

@@ -81,25 +81,12 @@ jobs:
 
       - name: Build and push version
         uses: docker/build-push-action@v5
-        if: ${{ inputs.push-to-dockerhub == 'true' }}
+        if: ${{ inputs.push-to-dockerhub }}
         with:
           push: ${{ inputs.push-to-dockerhub }}
           context: .
           file: docker/Dockerfile
-          tags: pennylaneai/pennylane:${{ inputs.lightning-version }}-${{ matrix.pl_backend }}
-          target: wheel-${{ matrix.pl_backend }}
-          build-args: |
-            LIGHTNING_VERSION=${{ inputs.lightning-version }}
-            PENNYLANE_VERSION=${{ inputs.pennylane-version }}
-
-      - name: Build and push latest
-        uses: docker/build-push-action@v5
-        if: ${{ inputs.push-to-dockerhub == 'true' }}
-        with:
-          push: ${{ inputs.push-to-dockerhub }}
-          context: .
-          file: docker/Dockerfile
-          tags: pennylaneai/pennylane:latest-${{ matrix.pl_backend }}
+          tags: pennylaneai/pennylane:${{ inputs.lightning-version }}-${{ matrix.pl_backend }},pennylaneai/pennylane:latest-${{ matrix.pl_backend }}
           target: wheel-${{ matrix.pl_backend }}
           build-args: |
             LIGHTNING_VERSION=${{ inputs.lightning-version }}

pennylane_lightning/core/_version.py

@@ -16,4 +16,4 @@
    Version number (major.minor.patch[-label])
 """
 
-__version__ = "0.38.0-dev3"
+__version__ = "0.38.0-dev4"