build: attempt to fix docker slim (#3322)

.github/actions/docker-slim/action.yml

@@ -13,13 +13,14 @@ runs:
   steps:
     - name: Setup docker slim
       run: |
-        if [ -d "/tmp/ds" ]; then
-          mkdir /tmp/ds
-          cd /tmp/ds
+        mkdir -p /tmp/ds
+        cd /tmp/ds
+        if [ ! -f /tmp/ds/slim ]; then
+          rm -f ds.tar.gz
           curl -L -o ds.tar.gz https://github.com/slimtoolkit/slim/releases/download/1.40.11/dist_linux.tar.gz
           tar -xvf ds.tar.gz --strip-components 1
-          echo "/tmp/ds" >> $GITHUB_PATH
         fi
+        echo "/tmp/ds" >> $GITHUB_PATH
       shell: bash
     - name: Run docker slim
       run: slim build --target ${{ inputs.target }} --tag ${{ inputs.tag }} --preserve-path /usr/share/nginx/html