Add issue template (#1485)

.github/ISSUE_TEMPLATE/Image_issue.md

@@ -0,0 +1,12 @@
+---
+name: 🐛 Image issue
+about: Issues related to the Nextcloud Docker image
+---
+
+<!--
+Thanks for reporting issues back to Nextcloud!
+
+Note: This is the issue tracker of Nextcloud **Docker image**, please do NOT use this to report issues with Docker or Nextcloud itself. You can find help debugging your system on our forums: https://help.nextcloud.com/ or https://forums.docker.com/.
+
+To learn more about official images, see https://github.com/docker-library/faq
+-->

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,7 @@
+contact_links:
+    - name: 🐳 Docker Support and Help
+      url: https://forums.docker.com/
+      about: Configuration, installation, networking and other questions
+    - name: ❓ Nextcloud Support and Help
+      url: https://help.nextcloud.com/
+      about: Configuration, webserver/proxy or performance issues and other questions