github: Replace issue template with issue form

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,78 @@
+name: Bug report
+description: Report a bug in the FRRouting software
+labels: triage
+body:
+  - type: markdown
+    attributes:
+      value: >
+        **This form is only for reporting a bug in the FRRouting software.**
+        If you need help troubleshooting your configuration, have a problem
+        building or installing the software, or want to ask a question or
+        discuss the project, learn how to [connect with the FRRouting
+        community](https://frrouting.org/community/).
+
+
+        **Do not include sensitive information in this report.** IP addresses
+        should be masked (example: 192.XXX.XXX.32/24).
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Provide a clear and concise description of the bug.
+    validations:
+      required: true
+  - type: textarea
+    id: version
+    attributes:
+      label: Version
+      description: >
+        Run the `show version` command in the VTY shell, and provide the output
+        here. (If possible, test the current development version of FRRouting
+        for this bug.)
+      render: text
+    validations:
+      required: true
+  - type: textarea
+    id: how-to-reproduce
+    attributes:
+      label: How to reproduce
+      description: >
+        Give a list of steps that someone else can follow to observe
+        the bug. Be as descriptive as possible, including any relevant
+        configuration files and commands used. Topology diagrams are
+        helpful when the bug involves more than one router.
+    validations:
+      required: true
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected behavior
+      description: >
+        What do you expect to happen when following the steps above?
+    validations:
+      required: true
+  - type: textarea
+    id: actual-behavior
+    attributes:
+      label: Actual behavior
+      description: >
+        What actually happens when following the steps above? Include
+        screenshots, log file snippets, and/or platform routing tables
+        as appropriate. If a crash occurs, provide a backtrace.
+    validations:
+      required: true
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: >
+        Include any other relevant information about this bug here.
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      options:
+        - label: I have searched the open issues for this bug.
+          required: true
+        - label: I have not included sensitive information in this report.
+          required: true