Add Github Actions Workflow to build and (unit-)test Audiveris

.github/install-tessdata.sh

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+#!/bin/sh
+set -e
+
+# This script loads tesseract-ocr files from github
+
+verify_single_argument_given() {
+  if [ $# -eq 0 ]; then
+    echo "No arguments supplied. Run e.g. 'install-tessdata.sh eng'. Aborting."
+    exit 1
+  fi
+  if [ $# -gt 1 ]; then
+    echo "Too many arguments supplied. Run e.g. 'install-tessdata.sh eng'. Aborting."
+    exit 1
+  fi
+}
+
+verify_tessdata_prefix_set() {
+  if [ -z "${TESSDATA_PREFIX}" ]; then
+    echo "Environment variable TESSDATA_PREFIX is not set. Aborting."
+    exit 2
+  fi
+}
+
+verify_tessdata_tag_set() {
+  if [ -z "${TESSDATA_TAG}" ]; then
+    echo "Environment variable TESSDATA_TAG is not set. Please set it to a valid github tag of tesseract-ocr/tessdata. Aborting."
+    exit 2
+  fi
+}
+
+install_tessdata_language() {
+  language=$1
+  echo "Loading tessdata language $language..."
+  wget --no-verbose -P "$TESSDATA_PREFIX" "https://github.com/tesseract-ocr/tessdata/raw/${TESSDATA_TAG}/${language}.traineddata"
+}
+
+verify_single_argument_given "$@"
+verify_tessdata_prefix_set
+verify_tessdata_tag_set
+install_tessdata_language "$1"

.github/workflows/build-and-test.yml

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+name: Build & Test Audiveris
+
+# execute this workflow on every push
+on:
+  - push
+
+permissions:
+  contents: read
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    env:
+      TESSDATA_PREFIX: /home/runner/work/audiveris/audiveris/tessdata
+      TESSDATA_TAG: 4.1.0
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Setup Java 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: 17
+          distribution: zulu
+
+      # cache loaded tessdata files so they don't have to be re-downloaded on every workflow execution
+      - name: Get cached tessdata files
+        id: cache-tessdata
+        uses: actions/cache@v3
+        with:
+          path: ${{ env.TESSDATA_PREFIX }}
+          key: ${{ runner.os }}-tessdata-${{ env.TESSDATA_TAG }}-eng-deu
+
+      - name: Install tessdata files
+        if: steps.cache-tessdata.outputs.cache-hit != 'true'
+        run: |
+          ${GITHUB_WORKSPACE}/.github/install-tessdata.sh eng &&
+          ${GITHUB_WORKSPACE}/.github/install-tessdata.sh deu
+
+      - name: Build Audiveris
+        uses: gradle/[email protected]
+        with:
+          arguments: build -x test
+
+      - name: Unit-Test Audiveris
+        uses: gradle/[email protected]
+        with:
+          arguments: test