update github actions to use erlef/setup-beam

.github/workflows/main.yml

@@ -1,29 +1,47 @@
 name: OpenTelemetry Zipkin Tests
 
-on: [push]
+on:
+  pull_request:
+    branches:
+      - 'master'
+  push:
+    branches:
+      - 'master'
 
 jobs:
   build:
     name: Test on OTP ${{ matrix.otp_version }} and ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
-
-    services:
-      zipkin:
-        image: openzipkin/zipkin-slim
-        ports:
-        - 9411:9411
-
     strategy:
       matrix:
-        otp_version: [21, 22]
-        os: [ubuntu-latest]
-
-    container:
-      image: erlang:${{ matrix.otp_version }}
-
+        otp_version: ['24.0.2', '23.3.4.2', '22.3.4.20']
+        rebar3_version: ['3.16.1']
+        os: [ubuntu-18.04]
+        include:
+          - otp_version: '21.3.8.24'
+            rebar3_version: '3.15.2'
+            os: ubuntu-18.04
+    env:
+      OTP_VERSION: ${{ matrix.otp_version }}
+      OTEL_TRACES_EXPORTER: "none"
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
+    - name: Run Zipkin
+      run: docker-compose up -d
+    - uses: erlef/setup-beam@v1
+      with:
+        otp-version: ${{ matrix.otp_version }}
+        rebar3-version: ${{ matrix.rebar3_version }}
+        elixir-version: '1.11.1'
+    - uses: actions/cache@v2
+      name: Cache
+      with:
+        path: |
+          _build
+        key: ${{ runner.os }}-build-${{ matrix.otp_version }}-${{ hashFiles(format('rebar.lock')) }}-2
+        restore-keys: |
+          ${{ runner.os }}-build-${{ matrix.otp_version }}-2-
     - name: Compile
       run: rebar3 compile
-    - name: Run tests
+    - name: Common Test tests
       run: rebar3 ct