chore: only run coverage once (#103)

.check.exs

@@ -11,13 +11,6 @@
     ## ...or adjusted (e.g. use one-line formatter for more compact credo output)
     # {:credo, "mix credo --format oneline"},
 
-    {:ex_unit,
-     command:
-       if System.get_env("ASH_CI") == "true" do
-         "mix coveralls.github"
-       else
-         "mix test"
-       end},
     {:check_formatter, command: "mix ash.formatter --check"}
 
     ## custom new tools may be added (mix tasks or arbitrary commands)

.github/workflows/elixir.yml

@@ -26,7 +26,6 @@ jobs:
             otp: 23.0.3
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      ASH_CI: true
     steps:
       - run: sudo apt-get install --yes erlang-dev
       - uses: actions/checkout@v2
@@ -51,6 +50,31 @@ jobs:
         if: startsWith(github.ref, 'refs/tags/v')
       - run: mix check
         if: "!startsWith(github.ref, 'refs/tags/v')"
+  coverage:
+    needs: [build]
+    runs-on: ubuntu-latest
+    name: Report Test Coverage
+    strategy:
+      matrix:
+        otp: ["23"]
+        elixir: ["1.10.0"]
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - run: sudo apt-get install --yes erlang-dev
+      - uses: actions/checkout@v2
+      - uses: actions/setup-elixir@v1
+        with:
+          otp-version: ${{matrix.otp}}
+          elixir-version: ${{matrix.elixir}}
+      - uses: actions/cache@v1
+        id: cache-deps
+        with:
+          path: deps
+          key: otp-${{matrix.otp}}-elixir-${{matrix.elixir}}-deps-2-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+          restore-keys: otp-${{matrix.otp}}-elixir-${{matrix.elixir}}-deps-2-
+      - run: mix deps.get
+      - run: mix coveralls.github
   release:
     needs: [build]
     if: startsWith(github.ref, 'refs/tags/v')
@@ -62,7 +86,6 @@ jobs:
         elixir: ["1.10.0"]
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      ASH_CI: true
     steps:
       - run: sudo apt-get install --yes erlang-dev
       - uses: actions/checkout@v2