Use new issue forms for bug reports

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -0,0 +1,85 @@
+---
+name: Bug report
+about: |
+  Create a report to help us improve
+
+  ⚠ If you're reporting an issue for `--use-feature=2020-resolver`, use
+  the "Dependency resolver failures / errors" template instead.
+title: '[Bug]: '
+labels:
+- >-
+  S: needs triage
+- >-
+  type: bug
+issue_body: true  # default: true, adds a classic WSYWIG textarea, if on
+inputs:
+- type: description
+  attributes:
+    value: |
+      **Environment**
+
+      ⚠ If you're reporting an issue for `--use-feature=2020-resolver`,
+      use the "Dependency resolver failures / errors" template instead.
+
+- type: input
+  attributes:
+    label: pip version
+    required: true
+- type: input
+  attributes:
+    label: Python version
+    required: true
+- type: input
+  attributes:
+    label: OS
+    required: true
+- type: textarea
+  attributes:
+    label: Additional information
+    description: >-
+      Feel free to add more information about your environment here.
+
+- type: textarea
+  attributes:
+    label: Description
+    description: >-
+      A clear and concise description of what the bug is.
+
+- type: textarea
+  attributes:
+    label: Expected behavior
+    description: >-
+      A clear and concise description of what you expected to happen.
+
+- type: textarea
+  attributes:
+    label: How to Reproduce
+    description: >-
+      Describe the steps to reproduce this bug.
+    value: |
+      1. Get package from '...'
+      2. Then run '...'
+      3. An error occurs.
+
+- type: textarea
+  attributes:
+    label: Output
+    description: >-
+      Paste the output of the steps above, including the commands
+      themselves and pip's output/traceback etc.
+    value: |
+      ```console
+
+      ```
+
+- type: checkboxes
+  attributes:
+    label: Code of Conduct
+    description: |
+      Read the [PSF Code of Conduct][CoC] first.
+
+      [CoC]: https://github.com/pypa/.github/blob/main/CODE_OF_CONDUCT.md
+    choices:
+    - label: I agree to follow the PSF Code of Conduct
+      required: true
+...