try setting up github actions

Author: jgabry

.Rbuildignore

@@ -16,3 +16,4 @@ vignettes/loo2-non-factorizable_cache/*
 ^\.appveyor\.yml$
 ^\.codecov\.yml$
 .github/*
+^\.github$

.appveyor.yml

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

.codecov.yml

@@ -0,0 +1,84 @@
+# For help debugging build failures open an issue on the RStudio community with the 'github-actions' tag.
+# https://community.rstudio.com/new-topic?category=Package%20development&tags=github-actions
+on:
+  push:
+    branches:
+      - main
+      - master
+  pull_request:
+    branches:
+      - 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: windows-latest, r: 'release'}
+          - {os: macOS-latest, r: 'release'}
+          - {os: ubuntu-20.04, r: 'release', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
+          - {os: ubuntu-20.04, r: 'devel', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
+
+    env:
+      R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
+      RSPM: ${{ matrix.config.rspm }}
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: r-lib/actions/setup-r@v1
+        with:
+          r-version: ${{ matrix.config.r }}
+
+      - uses: r-lib/actions/setup-pandoc@v1
+
+      - name: Query dependencies
+        run: |
+          install.packages('remotes')
+          saveRDS(remotes::dev_package_deps(dependencies = TRUE), ".github/depends.Rds", version = 2)
+          writeLines(sprintf("R-%i.%i", getRversion()$major, getRversion()$minor), ".github/R-version")
+        shell: Rscript {0}
+
+      - name: Cache R packages
+        if: runner.os != 'Windows'
+        uses: actions/cache@v2
+        with:
+          path: ${{ env.R_LIBS_USER }}
+          key: ${{ runner.os }}-${{ hashFiles('.github/R-version') }}-1-${{ hashFiles('.github/depends.Rds') }}
+          restore-keys: ${{ runner.os }}-${{ hashFiles('.github/R-version') }}-1-
+
+      - name: Install system dependencies
+        if: runner.os == 'Linux'
+        run: |
+          while read -r cmd
+          do
+            eval sudo $cmd
+          done < <(Rscript -e 'writeLines(remotes::system_requirements("ubuntu", "20.04"))')
+
+      - name: Install dependencies
+        run: |
+          remotes::install_deps(dependencies = TRUE)
+          remotes::install_cran("rcmdcheck")
+        shell: Rscript {0}
+
+      - name: Check
+        env:
+          _R_CHECK_CRAN_INCOMING_REMOTE_: false
+        run: rcmdcheck::rcmdcheck(args = c("--no-manual", "--as-cran"), error_on = "warning", check_dir = "check")
+        shell: Rscript {0}
+
+      - name: Upload check results
+        if: failure()
+        uses: actions/upload-artifact@main
+        with:
+          name: ${{ runner.os }}-r${{ matrix.config.r }}-results
+          path: check

.github/.gitignore

@@ -4,8 +4,7 @@
 [![CRAN_Status_Badge](https://www.r-pkg.org/badges/version/loo?color=blue)](https://cran.r-project.org/web/packages/loo)
 [![RStudio_CRAN_mirror_downloads_badge](https://cranlogs.r-pkg.org/badges/loo?color=blue)](https://cran.r-project.org/web/packages/loo)
 [![codecov](https://codecov.io/gh/stan-dev/loo/branch/master/graph/badge.svg)](https://codecov.io/github/stan-dev/loo?branch=master)
-[![Travis-CI Build Status](https://travis-ci.org/stan-dev/loo.svg?branch=master)](https://travis-ci.org/stan-dev/loo)
-[![AppVeyor build status](https://ci.appveyor.com/api/projects/status/github/stan-dev/loo?branch=master&svg=true)](https://ci.appveyor.com/project/jgabry/loo)
+[![R-CMD-check](https://github.com/stan-dev/loo/workflows/R-CMD-check/badge.svg)](https://github.com/stan-dev/loo/actions)
 <!-- badges: end -->
 
 ### Efficient approximate leave-one-out cross-validation for fitted Bayesian models