ci: Make scala 2.12 build on Java 11 and 2.11 on 8

Author: asm0dey

.github/workflows/build12.yml .github/workflows/build.yml.github/workflows/build12.yml renamed to .github/workflows/build.yml

@@ -1,4 +1,4 @@
-name: Build with Scala 2.12
+name: Build and test
 
 on:
   push:
@@ -7,7 +7,7 @@ on:
     branches: [main]
 
 jobs:
-  build:
+  build-scala-12:
     runs-on: ubuntu-latest
 
     steps:
@@ -26,5 +26,22 @@ jobs:
           restore-keys: ${{ runner.os }}-m2
       - name: Build with Maven
         run: ./mvnw -B package --file pom.xml -Pscala-2.12
+  build-scala-11:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 8
+      - name: Cache Maven packages
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-m2
+      - name: Build with Maven
+        run: ./mvnw -B package --file pom.xml -Pscala-2.11
 
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