github: issue templates

Add issue templates for bug reports, feature requests and new releases.

.github/ISSUE_TEMPLATE/bug-report.yaml

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+name: Bug report
+description: Report an issue
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug Description
+      description: Please describe the bug
+      value: "A clear and concise description of what the bug is"
+    validations:
+      required: true
+  - type: textarea
+    id: expected_behavior
+    attributes:
+      label: Expected behavior
+      description: Please describe the behavior you expected
+      value: "A clear and concise description of what you expected to happen"
+    validations:
+      required: true
+  - type: textarea
+    id: experienced_behavior
+    attributes:
+      label: Experienced behavior
+      description: Please describe the behavior you experienced
+      value: "A clear and concise description of what actually happened"
+    validations:
+      required: true
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to reproduce the behavior
+      description: Please explain the steps to reproduce the experienced behavior
+      value: |-
+        Steps to reproduce the behavior
+        1.
+        2.
+        3.
+    validations:
+      required: true
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Describe the environment you have
+      value: |-
+          - nri-plugin(s):
+          - container runtime:
+          - OS:
+          - kernel:
+          - Kubernetes version:
+    validations:
+      required: false
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here
+      value: "Additional information about the bug"
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/feature-request.yaml

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+name: Feature request
+description: Suggest an idea for this project
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Describe the solution you'd like
+      value: "A clear and concise description of you want to happen."
+    validations:
+      required: true
+  - type: textarea
+    id: rationale
+    attributes:
+      label: Rationale
+      description: Describe why this is needed
+      value: "A clear and concise description of the use case and/or justification for the feature"
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/new-release.md

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+---
+name: New release
+about: Propose a new major release
+title: Release v0.0.0
+labels: ''
+assignees: ''
+
+---
+
+## Release Process
+
+<!--
+If making adjustments to the checklist please also file a PR against this issue
+template (.github/ISSUE_TEMPLATE/new-release.md) to incorporate the changes for
+future releases.
+-->
+
+- [ ] Create and push new release branch
+- Local release preparations (on the release branch)
+  - [ ] Run e2e tests
+  - [ ] Sync/tidy up dependencies.
+    - [ ] Run `go mod tidy`.
+    - [ ] Run `git commit -m 'go.mod,go.sum: update dependencies.' go.{mod,sum}`, if necessary.
+  - [ ] Run `git tag -a -m "NRI plugins $VERSION" $VERSION`.
+- Publishing
+  - [ ] Push the tag with `git push $VERSION`.
+  - [ ] Check that new container images are published for the tag.
+    - ```
+      for i in nri-resource-policy-topology-aware nri-resource-policy-balloons nri-resource-policy-template nri-config-manager nri-memory-qos nri-memtierd; do \
+          skopeo inspect --format "$i: {{.Digest}}" docker://ghcr.io/containers/nri-plugins/$i:$VERSION;
+      done
+      ```
+  - [ ] Finalize the new *draft* release created by CI
+    - [ ] Check that all artefacts (Helm charts) were uploaded
+    - [ ] Write the change log to the release.
+    - [ ] Get the change log OK'd by other maintainers.
+  - [ ] Publish the draft as a release.
+  - [ ] Verify that the Helm repo was updated
+  - [ ] Add a link to the tagged release in this issue.
+- [ ] Close this issue.