ci: Lowercase docker image tag

https://firetail-io.atlassian.net/browse/FIRE-1839

Author: gregalia

.github/workflows/draft-release.yml

@@ -33,8 +33,9 @@ jobs:
 
       - name: Set Image Tags From Release Output
         run: |
+          NAMESPACE="$(awk '{print(tolower())}' <<<${{ github.repository_owner }})"
           cat <<HEREDOC >>${GITHUB_ENV}
-          TAG_BASE=${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
+          TAG_BASE=${{ env.REGISTRY }}/${NAMESPACE}/${{ env.IMAGE_NAME }}
           PRERELEASE_IMAGE_TAG=${{ steps.draft_release.outputs.tag_name }}-prerelease
           PRERELEASE_LAMBDA_IMAGE_TAG=${{ steps.draft_release.outputs.tag_name }}-lambda-prerelease
           HEREDOC

.github/workflows/publish-release.yml

@@ -22,7 +22,8 @@ jobs:
 
       - name: Set Image Tags
         run: |
-          echo "TAG_BASE=${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}" >>${GITHUB_ENV}
+          NAMESPACE="$(awk '{print(tolower())}' <<<${{ github.repository_owner }})"
+          echo "TAG_BASE=${{ env.REGISTRY }}/${NAMESPACE}/${{ env.IMAGE_NAME }}" >>${GITHUB_ENV}
 
       - name: Log In to the Container Registry
         run: |