CLDR-18999 auto generate production data if data ref is missing

Author: srl295

.github/workflows/build-json.yml

@@ -22,8 +22,8 @@ on:
             required: true
             default: 'unicode-org/cldr-staging'
         data-ref:
-            description: 'Data (staging) ref/tag/branch to use'
-            required: true
+            description: 'Data (staging) ref/tag/branch to use (otherwise, generate production data)'
+            required: false
             default: 'main'
         data-dir:
             description: 'Path in Data repo'
@@ -61,11 +61,19 @@ jobs:
                       ${{ runner.os }}-maven-
             - name: Clone Data
               uses: actions/checkout@v5
+              if: github.event.inputs.data-ref != ''
               with:
                 ref: ${{ github.event.inputs.data-ref }}
                 repository: ${{ github.event.inputs.data-repo }}
                 sparse-checkout: ${{ github.event.inputs.data-dir }}
                 path: cldr-staging
+            - name: Generate Production
+              if: github.event.inputs.data-ref == ''
+              run: |
+                cd cldr
+                mkdir -p ../cldr-staging/${{ github.event.inputs.data-dir }}
+                mvn -s ../cldr/.github/workflows/mvn-settings.xml -B compile install package --file=tools/pom.xml -pl cldr-code
+                mvn -s ../cldr/.github/workflows/mvn-settings.xml -B -DCLDR_DIR=$(pwd) -DCLDR_GITHUB_ANNOTATIONS=true --file=tools/pom.xml -pl cldr-code exec:java -Dexec.mainClass=org.unicode.cldr.tool.GenerateProductionData
             - name: Setup Config
               run: |
                 cd cldr-json