Test render in a dedicated workflow

.github/workflows/test-reports.yaml

@@ -0,0 +1,45 @@
+# Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+on:
+  push:
+    branches: [main, master]
+    paths:
+      - 'inst/**'
+  pull_request:
+    branches: [main, master]
+    paths:
+      - 'inst/**'
+
+name: test reports
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test-reports:
+    runs-on: ubuntu-latest
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: r-lib/actions/setup-pandoc@v2
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          use-public-rspm: true
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          extra-packages:
+            sodium # it would be good to automatically identify system dependencies in the future
+      - run: |
+          library(episoap)
+          for (tp in list_templates()) {
+            rmarkdown::render(
+              system.file("rmarkdown", "templates", tp, "skeleton", "skeleton.Rmd",
+                package = "episoap"
+              ),
+              output_file = tempfile(),
+              quiet = TRUE
+            )
+          }
+        shell: Rscript {0}