fix: Handle upper case chars in repo name #5503

This resolves an error on the "Check Docker image" build step for any forks under GitHub users with an upper case character in their GitHub username.

Author: joshooaj

Diff for: .github/workflows/build.yml

@@ -144,9 +144,11 @@ jobs:
 
       - name: Check Docker image
         working-directory: /tmp
+        env:
+          REPO_FULL_NAME: '${{ github.event.repository.full_name }}'
         run: |
-          docker run --rm -i -v ${PWD}:/docs ${{ github.event.repository.full_name }}:${{ steps.meta.outputs.version }} new .
-          docker run --rm -i -v ${PWD}:/docs ${{ github.event.repository.full_name }}:${{ steps.meta.outputs.version }} build
+          docker run --rm -i -v ${PWD}:/docs ${REPO_FULL_NAME,,}:${{ steps.meta.outputs.version }} new .
+          docker run --rm -i -v ${PWD}:/docs ${REPO_FULL_NAME,,}:${{ steps.meta.outputs.version }} build
 
       - name: Set platforms
         if: github.event_name == 'release'