ci: add GitHub actions and workflows

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Bug reports and questions on CAP CDS Language Support for IntelliJ
+    url: https://github.com/cap-js/cds-intellij/issues
+    about: Please ask questions here.

.github/actions/gradle-run/action.yml

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+name: gradle-run
+description: Build the plugin using gradle
+
+inputs:
+  steps:
+    description: 'The run steps to perform'
+    required: true
+
+runs:
+  using: composite
+
+  steps:
+    - name: Install fontconfig
+      # required for headless gradle
+      run: |
+        apt-get -y update
+        apt-get -y install fontconfig
+      shell: bash
+      env:
+        DEBIAN_FRONTEND: noninteractive
+        TZ: Etc/UTC
+
+    - uses: actions/setup-node@v3
+      with:
+        node-version: 18
+
+    - uses: actions/setup-java@v3
+      with:
+        distribution: zulu
+        java-version: 17
+
+    - name: Build
+      if: ${{ contains(inputs.steps, 'build') }}
+      shell: bash
+      run: |
+        ./gradlew buildPlugin
+        ls -la build/distributions
+
+    - name: Test
+      if: ${{ contains(inputs.steps, 'test') }}
+      shell: bash
+      run: |
+        ./gradlew test --info
+
+    - uses: actions/upload-artifact@v3
+      if: ${{ contains(inputs.steps, 'test') }}
+      with:
+        name: test-results
+        path: ./build/test-results/test

.github/workflows/main.yml

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+name: Main
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+concurrency:
+  group: release-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  main-build:
+    runs-on: ubuntu-latest
+    container:
+      image: ubuntu:22.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: ./.github/actions/gradle-run
+        with:
+          steps: |-
+            build
+            test
+
+      - name: Upload build artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: build results
+          path: build/distributions/intellij-cds.zip
+          retention-days: 5

.github/workflows/pr.yml

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+name: PR
+
+on:
+  pull_request:
+    paths:
+      - src/**
+      - lsp/**
+      - build.gradle
+      - gradle.properties
+      - local.properties
+      - .github/**
+  workflow_dispatch:
+
+concurrency:
+  group: build-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  pr-build:
+    runs-on: ubuntu-latest
+    container:
+      image: ubuntu:22.04
+    env:
+      CI: true
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: ./.github/actions/gradle-run
+        with:
+          steps: |-
+            test

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    branches: [release]
+  workflow_dispatch:
+
+concurrency:
+  group: release-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  release-build:
+    runs-on: ubuntu-latest
+    container:
+      image: ubuntu:22.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: ./.github/actions/gradle-run
+        with:
+          steps: |-
+            build
+            test
+
+      - id: setenv
+        run: |
+          echo RELEASE_TAG=$(awk '/pluginVersion/ { print $3 }' gradle.properties) >> $GITHUB_OUTPUT
+          echo "TODAY_DATE=$(date +%Y-%m-%d)" >> $GITHUB_OUTPUT
+          echo "CHANGE_LOG=$(awk '/<change-notes>/ { a=1; next } a==1 && /<ul>/ { a=2 } a==2 { gsub(/^[ \t]+/, ""); ORS=" "; print; if (/<\/ul>/) exit }' src/main/resources/META-INF/plugin.xml)" >> $GITHUB_OUTPUT
+
+      - run: |
+          echo "${{ steps.setenv.outputs.RELEASE_TAG }}"
+          echo "${{ steps.setenv.outputs.TODAY_DATE }}"
+          echo "${{ steps.setenv.outputs.CHANGE_LOG }}"
+
+      - uses: ncipollo/release-action@v1
+        with:
+          tag: ${{ steps.setenv.outputs.RELEASE_TAG }}
+          commit: main
+          token: ${{ secrets.GITHUB_TOKEN }}
+          draft: false
+          body: Build ${{ github.run_number }}<br>${{ steps.setenv.outputs.CHANGE_LOG }}
+          artifacts: build/distributions/intellij-cds.zip