Add github actions to stable-7 workflows

Signed-off-by: Gabriel Harris-Rouquette <gabizou@me.com>

.github/CONTRIBUTING.md

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+# Contribution Guidelines
+
+We will always have a need for developers to help us improve Sponge. There is no such thing as a perfect project and things can always be improved. If you are a developer and are interested in helping then please do not hesitate. Just make sure you follow our guidelines.
+
+Please check our [Contribution Guidelines in the Sponge Documentation](https://docs.spongepowered.org/en/contributing/guidelines.html) for more information.

.github/workflows/build-and-deploy.yaml

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+# This workflow will build a Java project with Gradle
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
+
+name: Build and Deploy
+
+on:
+  push:
+    branches: [ stable-7 ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: run number with offset
+          env:
+            NUM: ${{ GITHUB_RUN_NUMBER }}
+          run: |
+            echo ::set-env name=BUILD_NUMBER::$(($NUM+93))
+          - run: echo BUILD_NUMBER
+      - name: Build with Gradle
+        run: ./gradlew build
+        env:
+          CI_SYSTEM: Github Actions
+          GIT_COMMIT: ${{ GITHUB_SHA }}
+          GIT_BRANCH: ${{ GITHUB_REF }}
+      - name: Archive artifacts for build
+        uses: actions/upload-artifact@v2
+        with:
+          name: Sponge Jars
+          path: |
+            ${{ github.workspace }}/build/libs/*.jar
+      # The USERNAME and TOKEN need to correspond to the credentials environment variables used in
+      # the publishing section of your build.gradle
+      - name: Publish to Sponge Maven & GitHub Packages
+        run: ./gradlew uploadArchives
+        env:
+          GITHUB_USERNAME: ${{ github.actor }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          ORG_GRADLE_PROJECT_spongeRepo: ${{ secrets.CREEPER_REPO_URL }}
+          ORG_GRADLE_PROJECT_spongeSnapshotRepo: ${{ secrets.SPONGE_MAVEN_SNAPSHOT_REPO_URL }}
+          ORG_GRADLE_PROJECT_spongeReleaseRepo: ${{ secrets.SPONGE_MAVEN_RELEASE_REPO_URL }}
+          ORG_GRADLE_PROJECT_spongeUsername: ${{ secrets.CREEPER_REPO_USERNAME }}
+          ORG_GRADLE_PROJECT_spongePassword: ${{ secrets.CREEPER_REPO_PASSWORD }}
+
+

.github/workflows/build-prs.yaml

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+# This workflow will build a Java project with Gradle
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
+
+name: Build and archive PR with Gradle
+
+on:
+  pull_request:
+    branches: [ stable-7 ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: Build with Gradle
+        run: ./gradlew build
+      - name: Archive artifacts for build
+        uses: actions/upload-artifact@v2
+        with:
+          name: SpongeAPI Jars
+          path: |
+            ${{ github.workspace }}/build/libs/*.jar

.github/workflows/check-license.yaml

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+# This workflow will build a Java project with Gradle
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
+
+name: License Check
+
+on:
+  push:
+    branches: [ stable-7 ]
+  pull_request:
+    branches: [ stable-7 ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+      - uses: actions/cache@v2
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: Check license
+        run: ./gradlew checkLicenses

.github/workflows/gradle-wrapper-check.yaml

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+name: "Validate Gradle Wrapper"
+on: [push, pull_request]
+
+jobs:
+  validation:
+    name: "Validation"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: gradle/wrapper-validation-action@v1