Add initial github workflow.

.github/CODEOWNERS

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+* @sdkman/sdkman-cli

.github/auto_assign.yml

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+---
+addReviewers: true
+addAssignees: author
+
+reviewers:
+  - marc0der
+  - helpermethod
+
+numberOfReviewers: 0

.github/workflows/action.yml

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+---
+# yamllint disable-line rule:truthy
+name: 'Auto Assign'
+on: pull_request_target
+
+jobs:
+  add-reviews:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: kentaro-m/auto-assign-action@v1.1.2
+        with:
+          configuration-path: ".github/auto_assign.yml"

.github/workflows/run.yml

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+name: Run migration
+on: pull_request
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@v2
+      - name: Set up JDK 11.0.11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11.0.8
+      - name: Run with Gradle
+        run: ./gradlew clean test --info
+      - name: Build artifacts
+        run: ./gradlew -Penv=production clean assemble