ci: Improve GitHub related workflows and add tests

.github/dependabot.yml

+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    assignees:
+      - "Griefed"
+    labels:
+     - "dependencies"
+     - "github-actions"
+    target-branch: "dependabot"
+
+  - package-ecosystem: "gradle"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    assignees:
+      - "Griefed"
+    labels:
+      - "dependencies"
+      - "gradle"
+    target-branch: "dependabot"
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.github/workflows/test.yml

+name: Test
+
+on:
+  push:
+  pull_request:
+    branches:
+      - main
+      - master
+      - develop
+      - dependabot
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 8
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'adopt'
+          java-version: '8'
+      - name: Where is Java
+        run: which java
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: Build with Gradle
+        run: ./gradlew about build --no-daemon --info
+      - name: List files in libs
+        run: ls -ahl build/libs
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