Update issue templates (#1408)

Add an issue template for bug reports.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,50 @@
+---
+name: Bug report
+about: Create a report to help us improve
+labels: 'bug'
+assignees: ''
+
+---
+<!--
+Thank you for submitting a bug report!
+Please fill in the fields below to help us investigate the problem.
+-->
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Environment**
+- Cozystack version
+- Provider: on-prem, Hetzner, and so on
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behaviour**
+When taking the steps to reproduce, what should have happened differently?
+
+**Actual behaviour**
+A clear and concise description of what happens when the bug occurs. Explain how the system currently behaves, including error messages, unexpected results, or incorrect functionality observed during execution.
+
+
+**Logs**
+```
+Paste any relevant logs here. Please redact tokens, passwords, private keys.
+```
+
+**Screenshots**
+If applicable, add screenshots to help explain the problem.
+
+**Additional context**
+Add any other context about the problem here.
+
+**Checklist**
+- [ ] I have checked the documentation
+- [ ] I have searched for similar issues
+- [ ] I have included all required information
+- [ ] I have provided clear steps to reproduce
+- [ ] I have included relevant logs