Kjør coverage på ubuntu 24.04

Nå skal alle være over på ubuntu (fra macos), så closes #29

.github/workflows/test-coverage.yaml

@@ -1,4 +1,7 @@
 on:
+  push:
+    branches:
+      - main
   pull_request:
     branches:
       - main
@@ -7,36 +10,20 @@ name: test-coverage
 
 jobs:
   test-coverage:
-    runs-on: macOS-latest
+    runs-on: ubuntu-24.04
     env:
       GITHUB_PAT: ${{ secrets.GT }}
     steps:
       - uses: actions/checkout@v4
 
       - uses: r-lib/actions/setup-r@v2
 
-      - uses: r-lib/actions/setup-pandoc@v2
-
-      - 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
-        uses: actions/cache@v4
+      - uses: r-lib/actions/setup-r-dependencies@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 dependencies
-        run: |
-          install.packages(c("remotes"))
-          remotes::install_deps(dependencies = TRUE)
-          remotes::install_cran("covr")
-        shell: Rscript {0}
+          extra-packages: any::covr, any::xml2
+          needs: coverage
+
+      - uses: r-lib/actions/setup-pandoc@v2
 
       - name: Test coverage
         run: covr::codecov()