CRAN: add rhub workflow; include test regex fixes and C++ tidy

Author: zankrut20

.github/workflows/rhub-cran.yml

@@ -0,0 +1,31 @@
+name: rhub-check
+
+on:
+  push:
+    branches: [CRAN]
+  pull_request:
+    branches: [CRAN]
+  workflow_dispatch:
+
+jobs:
+  rhub:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup R
+        uses: r-lib/actions/setup-r@v2
+
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libxml2-dev libssl-dev libcurl4-openssl-dev
+
+      - name: Install R packages
+        run: |
+          R -e "install.packages(c('remotes','rhub'), repos='https://cloud.r-project.org')"
+
+      - name: Run rhub check for CRAN
+        run: |
+          R -e "rhub::check_for_cran(path = '.', show_status = TRUE)"