Fix update check

.forgejo/workflows/build.yaml

@@ -14,27 +14,27 @@ jobs:
     runs-on: docker
     steps:
       - name: Check if update available
-        if: env.SCHEDULED
+        if: env.SCHEDULED == 'true'
         id: check
         uses: https://github.com/ClementTsang/docker-check-base-image-diff@v0.0.2
         with:
           base-image: docker://ghcr.io/catthehacker/ubuntu:act-${{ env.VERSION }}
           derived-image: docker://${{ env.REPO }}:latest
       - name: Check result
-        if: env.SCHEDULED
+        if: env.SCHEDULED == 'true'
         run: echo "Needs updating = ${{ steps.check.outputs.differs }}"
       - name: Set up Docker Buildx
-        if: env.PUSHED || ${{ steps.check.outputs.differs == true }}
+        if: env.PUSHED == 'true' || steps.check.outputs.differs == 'true'
         uses: docker/setup-buildx-action@v3
       - name: Login to Docker registry
-        if: env.PUSHED || ${{ steps.check.outputs.differs == true }}
+        if: env.PUSHED == 'true' || steps.check.outputs.differs == 'true'
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ secrets.REGISTRY_USER }}
           password: ${{ secrets.REGISTRY_PASSWORD }}
       - name: Build and push image
-        if: env.PUSHED || ${{ steps.check.outputs.differs == true }}
+        if: env.PUSHED == 'true' || steps.check.outputs.differs == 'true'
         uses: docker/build-push-action@v5
         with:
           push: true