Add github workflow for JOSS draft paper.

.github/workflows/draft-pdf.yml

@@ -0,0 +1,23 @@
+on: [push]
+
+jobs:
+  paper:
+    runs-on: ubuntu-latest
+    name: Paper Draft
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - 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: doc/JOSS/1.0/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: doc/JOSS/1.0/paper.pdf

doc/JOSS/1.0/paper.md

@@ -79,7 +79,6 @@ The main idea behind these points is design the GWB so that users can easily cre
 
 ```json
 {
-
   "version": "1.0",
   "coordinate system":{"model":"spherical", "depth method":"begin segment"},
   "cross section":[[0,0.5],[1,-0.5]],