Add cffconvert.yml to validate CITATION.cff

.github/workflows/cffconvert.yml

@@ -0,0 +1,33 @@
+name: cffconvert
+
+on:
+  push:
+    branches:
+      - 'master'
+      - 'release-*'
+    paths:
+      - CITATION.cff
+  pull_request:
+    branches:
+      - 'master'
+      - 'release-*'
+    paths:
+      - CITATION.cff
+
+permissions:
+  contents: read
+
+jobs:
+  validate:
+    name: "validate"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out a copy of the repository
+        uses: actions/checkout@v2
+        with:
+          persist-credentials: false
+
+      - name: Check whether the citation metadata from CITATION.cff is valid
+        uses: citation-file-format/[email protected]
+        with:
+          args: "--validate"