add joss paper compile

.github/workflows/paper.yml

@@ -0,0 +1,27 @@
+---
+on:    # yamllint disable-line rule:truthy
+    push:
+    branches-ignore:
+        - '**'
+jobs:
+    paper:
+    runs-on: ubuntu-latest
+    name: Paper Draft
+    steps:
+        - name: Checkout
+          uses: actions/checkout@v2
+        - name: Build draft PDF
+          uses: openjournals/openjournals-draft-action@master
+          with:
+            journal: joss
+            # This should be the path to the paper within your repo.
+            paper-path: paper/paper.md
+        - name: Upload
+          uses: actions/upload-artifact@v1
+          with:
+            name: paper
+            # This is the output path where Pandoc will write the compiled
+            # PDF. Note, this should be the same directory as the input
+            # paper.md
+            path: paper/paper.pdf
+