CI setup (#11)

Configure simple CI for generating lexer files and Gradle tasks (build project, run Junit test)

.github/workflows/build.yml

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+name: Build project
+
+#workflow_dispatch -- for manual trigger
+on: [ push, workflow_dispatch ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v3
+        with:
+          java-version: '11'
+          distribution: 'temurin'
+
+      - name: Generate JFlex files
+        run: |
+          sudo apt-get install -y jflex
+          ./generate_lexers.sh
+
+      - name: Build with Gradle
+        uses: gradle/gradle-build-action@bd5760595778326ba7f1441bcf7e88b49de61a25 # v2.6.0
+        with:
+          arguments: build

generate_lexers.sh

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+#!/bin/bash
+
+shopt -s nullglob     #ingore failed patterns
+
+cd src/main/kotlin/org/srcgll/lexer
+
+for lexer_name in *.jflex *.jlex *.lex *.flex *.x
+do
+    jflex $lexer_name
+done