Fix typo in CI (#401)

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- [ ] "I certify that all code in this PR is my own, except as noted
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## Use of AI

- [ ] Includes AI-assisted code completion
- [ ] Includes code generated by an AI application
- [ ] Includes AI-generated tests (NOTE: AI written tests should have a
docstring that includes `## WRITTEN BY AI ##`)

Signed-off-by: Samuel Monson <smonson@redhat.com>

Author: sjmonson

.github/workflows/release-candidate.yml

@@ -311,7 +311,7 @@ jobs:
           image: ${{ github.event.repository.name }}
           build-args: |
             GUIDELLM_BUILD_TYPE=candidate
-          tags: ${{ env.package_version= }}~rc
+          tags: ${{ env.package_version }}~rc
           containerfiles: |
             ./Containerfile
       - name: Push To ghcr.io