minimal pandocin.yaml and init test for new action

.github/workflows/baseprinter.yaml

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+name: Deploy baseprint preview to GitHub Pages
+
+on:
+  push:
+    branches: [$default-branch]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# Grant GITHUB_TOKEN the permissions required to make a Pages deployment
+permissions:
+  pages: write
+  id-token: write
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: castedo/baseprinter-action
+        with:
+          defaults-file: "pandocin.yaml"
+  deploy:
+    needs: build
+    runs-on: ubuntu-22.04
+    steps:
+      - name: "Deploy to GitHub Pages"
+        id: deployment
+        uses: actions/deploy-pages@v2
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}

pandocin.yaml

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+# Reference https://pandoc.org/MANUAL.html#defaults-files
+
+# Change "/dev/null" to the name of a new input source file:
+input-file: "/dev/null"