validate actions

actions/validate/action.yml

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+# Copyright (c) 2024 The University of Manchester
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: "Unittests and style checks"
+description: >
+  Runs multiple validate actions
+runs:
+  using: composite
+  steps:
+    - name: Run rat copyright enforcement
+      uses: ./support/actions/check-copyrights
+      with:
+        config_file: rat_asl20.xml
+
+    - name: Build documentation with sphinx
+      uses: ./support/actions/sphinx
+      with:
+        directory: doc/source
+
+    - name: Validate CITATION.cff
+      if: ${{ matrix.checks == 'validate' }}
+      uses: dieghernan/cff-validator@main