Simplify vanilla-test

.github/workflows/vanilla-test.yml

@@ -1,46 +1,18 @@
 name: Run test via Pkg.test()
 
 on:
+  push:
+    branches:
+      - master
   pull_request:
 
 jobs:
   vanilla-test:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Resolve refs
-        run: |
-          git_fetch_branch() {
-              refspec="refs/heads/$1:refs/remotes/origin/$1"
-              git fetch --unshallow origin "$refspec" || git fetch origin "$refspec"
-          }
-          echo GITHUB_HEAD_REF=${GITHUB_HEAD_REF}
-          echo GITHUB_BASE_REF=${GITHUB_BASE_REF}
-          echo
-          git_fetch_branch ${GITHUB_HEAD_REF}
-          git_fetch_branch ${GITHUB_BASE_REF}
-      - run: git diff --name-only "origin/${GITHUB_BASE_REF}" "origin/${GITHUB_HEAD_REF}"
-      - name: Check if Pkg.test() is required
-        id: check-project-toml
-        run: |
-          if git diff --name-only "origin/${GITHUB_BASE_REF}" "origin/${GITHUB_HEAD_REF}" | \
-              grep -E '^Project\.toml|test/environments/main/Project\.toml$' > \
-              /dev/null
-          then
-              echo "::set-output name=need_test::yes"
-          else
-              echo "::set-output name=need_test::no"
-          fi
-      - name: Show output
-        run: echo "${{ steps.check-project-toml.outputs.need_test }}"
       - uses: julia-actions/setup-julia@v1
-        if: ${{ steps.check-project-toml.outputs.need_test == 'yes' }}
         with:
-          version: 1.4
+          version: ^1
       - uses: julia-actions/julia-buildpkg@latest
-        if: ${{ steps.check-project-toml.outputs.need_test == 'yes' }}
       - uses: julia-actions/julia-runtest@latest
-        if: ${{ steps.check-project-toml.outputs.need_test == 'yes' }}
-        env:
-          JULIA_NUM_THREADS: "2"
-          CI: "true"