IONOS(build): refactor JFrog properties construction to array-based approach

[Copilot]

Summary

Refactored JFrog artifact property construction from repeated string concatenation to array-based building. Improves maintainability and reduces error potential when adding/removing properties.

Before (string concatenation):

JFROG_PROPS="app.name=${APP_NAME}"
JFROG_PROPS="${JFROG_PROPS};app.sha=${APP_SHA}"
JFROG_PROPS="${JFROG_PROPS};vcs.branch=${{ github.ref_name }}"
# ...prone to missing semicolons or typos

After (array-based):

JFROG_PROPS_LIST=()
JFROG_PROPS_LIST+=("app.name=${APP_NAME}")
JFROG_PROPS_LIST+=("app.sha=${APP_SHA}")
JFROG_PROPS_LIST+=("vcs.branch=${{ github.ref_name }}")
JFROG_PROPS=$(IFS=';'; printf '%s' "${JFROG_PROPS_LIST[*]}")

Changes:

• Replaced string concatenation with Bash array operations in both build-external-apps and upload-to-jfrog jobs
• Used IFS-based joining to construct semicolon-separated property strings
• Maintained consistent pattern across both upload locations

TODO

• ...

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

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