Have CI working with extra checks

.github/workflows/main.yml

@@ -12,20 +12,20 @@ jobs:
   build:
     name: Test on OTP ${{ matrix.otp_version }} and ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
+    container:
+      image: erlang:${{matrix.otp_version}}
 
     strategy:
       matrix:
-        otp_version: ['23.2.1', '22.3.4.2', '21.3.8.16', '20.3.8.21', '19.3.6.13']
+        otp_version: ['23.2', '22.3', '21.3', '20.3', '19.3']
         os: [ubuntu-latest]
 
     steps:
     - uses: actions/checkout@v2
 
-    - uses: bajankristof/setup-erlang@master
-      with:
-        otp-version: ${{ matrix.otp_version }}
-
     - name: Compile
       run: rebar3 compile
+    - name: Dialyze
+      run: rebar3 as test dialyzer
     - name: EUnit tests
       run: TERM=xterm rebar3 eunit