implemented gh actions via usethis::use_github_action_check_standard(…

…), followed by manual modifications; initial testing may fail before setup of GITHUB_PAT is complete

.Rbuildignore

@@ -4,3 +4,4 @@
 ^build-scripts$
 ^examples$
 ^inst/doc$
+^\.github$

.github/.gitignore

@@ -0,0 +1 @@
+*.html

.github/workflows/R-CMD-check.yaml

@@ -0,0 +1,73 @@
+# 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
+name: R CI/CD test #R-CMD-check
+
+on:
+  push:
+    # branches: [main, master]
+        paths-ignore:
+      - '**.md'  # prevent md files (e.g., README.md) in any repo dir from trigering workflow
+      - '**.bib'
+      - '**.ya?ml'  # captures both .yml and .yaml
+      - 'LICENSE'
+      - '.gitignore'
+  pull_request:
+    branches: [master, develop]
+    paths-ignore:
+      - '**.md'
+      - '**.bib'
+      - '**.ya?ml'
+      - 'LICENSE'
+      - '.gitignore'
+
+jobs:
+  R-CMD-check:
+    runs-on: ${{ matrix.config.os }}
+
+    name: ${{ matrix.config.os }} (${{ matrix.config.r }})
+
+    strategy:
+      fail-fast: false
+      matrix:
+        config:  # generated by 
+          - {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
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: r-lib/actions/setup-pandoc@v1
+
+      - uses: r-lib/actions/setup-r@v1
+        with:
+          r-version: ${{ matrix.config.r }}
+          http-user-agent: ${{ matrix.config.http-user-agent }}
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v1
+        with:
+          extra-packages: rcmdcheck
+
+      - uses: r-lib/actions/check-r-package@v1
+
+      - name: Show testthat output
+        if: always()  # step will run even if previous steps fail
+        run: find check -name 'testthat.Rout*' -exec cat '{}' \; || true
+        shell: bash
+
+      - name: Upload check results
+        if: failure()  # if any of the previous steps fail, export a log
+        uses: actions/upload-artifact@main
+        with:
+          name: ${{ runner.os }}-r${{ matrix.config.r }}-results
+          path: check
+
+  # Another job:
+    # runs-on: ?

README.md

@@ -1,4 +1,5 @@
 # useeior
+[![R-CMD-check](https://github.com/USEPA/useeior/workflows/R-CMD-check/badge.svg)](https://github.com/USEPA/useeior/actions)
 
 `useeior` is an R package for building and using [USEEIO models](https://www.epa.gov/land-research/us-environmentally-extended-input-output-useeio-models). The [model object](format_specs/Model.md) is the primary output that is built according to a given [model specification](format_specs/ModelSpecification.md) and optional [disaggregation specification](format_specs/DisaggregationSpecification.md). [Model specifications](inst/extdata/modelspecs) and associated [disaggregation specifications](inst/extdata/disaggspecs) for EPA-validated models are included in the package. The package offers various functions for validating, calculating, visualizing, and writing out models or their components. `useeior` is a core component of the [USEEIO Modeling Framework](https://github.com/USEPA/useeio).