add checks + update Rbuildignore

Author: giabaio

.Rbuildignore

@@ -22,3 +22,4 @@
 ^revdep$
 ^CRAN-SUBMISSION$
 ^CITATION.cff
+^\.github$

.github/workflows/check-standard.yaml

@@ -0,0 +1,50 @@
+# Workflow derived from https://github.com/r-lib/actions/tree/master/examples
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+on:
+  push:
+    branches: [dev, main, master]
+  pull_request:
+    branches: [dev, main, master]
+
+name: R-CMD-check
+
+jobs:
+  R-CMD-check:
+    runs-on: ${{ matrix.config.os }}
+
+    name: ${{ matrix.config.os }} (${{ matrix.config.r }})
+
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - {os: macOS-latest,   r: 'release'}
+          - {os: windows-latest, r: 'release'}
+          - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
+          - {os: ubuntu-latest,   r: 'release'}
+          - {os: ubuntu-latest,   r: 'oldrel-1'}
+
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      R_KEEP_PKG_SOURCE: yes
+      RSPM: ${{ matrix.config.rspm }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: r-lib/actions/setup-pandoc@v2
+      
+      - name: Double check repos
+        run: |
+          print(getOption("repos"))
+        shell: Rscript {0}
+
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          dependencies: '"all"'
+          extra-packages: |
+             rcmdcheck
+          
+      - uses: r-lib/actions/check-r-package@v2
+        with:
+          upload-snapshots: true