add citation file and validating GHA

.github/workflows/ci-citation

@@ -0,0 +1,30 @@
+name: ci-citation
+
+on:
+  pull_request:
+    paths:
+      - "CITATION.cff"
+
+  push:
+    paths:
+      - "CITATION.cff"
+
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  validate:
+    name: "validate"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: "check CITATION.cff"
+        uses: citation-file-format/[email protected]
+        with:
+          args: "--validate"

CITATION.cff

@@ -0,0 +1,11 @@
+cff-version: 1.2.0
+message: "If Iris played an important part in your research then please add us to your reference list by using the references below."
+title: "Iris"
+authors:
+    - name: "Iris contributors"
+abstract: "A powerful, format-agnostic, and community-driven Python package for analysing and visualising Earth science data"
+license: "LGPL-3.0"
+doi: "10.5281/zenodo.595182"
+url: "http://scitools.org.uk/"
+repository-code: "https://github.com/SciTools/iris"
+type: "software"

MANIFEST.in

@@ -19,6 +19,7 @@ exclude CODE_OF_CONDUCT.md
 exclude codecov.yml
 include COPYING
 include COPYING.LESSER
+include CITATION.cff
 exclude Makefile
 exclude noxfile.py