Update docker-publish.yml

Updated Release tag to 2.1.2

Author: xtr0py

.github/workflows/docker-publish.yml

@@ -26,7 +26,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Setup default version
-        run: echo "DNSCRYPT_PROXY_VERSION=2.1.1" >> $GITHUB_ENV
+        run: echo "DNSCRYPT_PROXY_VERSION=2.1.2" >> $GITHUB_ENV
         if: ${{ env.DNSCRYPT_PROXY_VERSION == '' }}
 
       - name: Setup Docker buildx