Fix version syntax

Author: mjsir911

.github/workflows/docker-publish.yml

@@ -64,9 +64,7 @@ jobs:
 
       - name: Get latest version number
         id: get_version
-        run:
-          - echo -n "::set-output name=version::"
-          - curl --silent https://pypi.python.org/pypi/Trac/json | jq -r .info.version
+        run: echo "TRAC_VERSION=$(curl --silent https://pypi.org/pypi/trac/json | jq -r .info.version)" >> $GITHUB_OUTPUT
 
       - name: Build and push unstable Docker image
         id: build-and-push-unstable
@@ -96,9 +94,9 @@ jobs:
           tags: |
             ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:stable
             ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{steps.get_version.outputs.version}}
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{steps.get_version.outputs.TRAC_VERSION}}
           build-args: |
-            TRAC_INSTALL_URL=https://download.edgewall.org/trac/Trac-${{steps.get_version.outputs.version}}.tar.gz
+            TRAC_INSTALL_URL=https://download.edgewall.org/trac/Trac-${{steps.get_version.outputs.TRAC_VERSION}}.tar.gz
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max