update from

https://github.com/r-lib/actions/tree/master/examples#lint-workflow

.github/workflows/lint.yaml

@@ -1,9 +1,11 @@
 on:
   push:
     branches:
+      - main
       - master
   pull_request:
     branches:
+      - main
       - master
 
 name: lint
@@ -16,7 +18,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - uses: r-lib/actions/setup-r@master
+      - uses: r-lib/actions/setup-r@v1
 
       - name: Query dependencies
         run: |
@@ -25,8 +27,8 @@ jobs:
           writeLines(sprintf("R-%i.%i", getRversion()$major, getRversion()$minor), ".github/R-version")
         shell: Rscript {0}
 
-      - name: Cache R packages
-        uses: actions/cache@v1
+      - name: Restore R package cache
+        uses: actions/cache@v2
         with:
           path: ${{ env.R_LIBS_USER }}
           key: ${{ runner.os }}-${{ hashFiles('.github/R-version') }}-1-${{ hashFiles('.github/depends.Rds') }}
@@ -39,6 +41,9 @@ jobs:
           remotes::install_cran("lintr")
         shell: Rscript {0}
 
+      - name: Install package
+        run: R CMD INSTALL .
+
       - name: Lint
         run: lintr::lint_package()
         shell: Rscript {0}