Update custom-apps.md

[malay-gondalia]

updated docs to confirm download from git repo as per changes made in my update.

Please provide enough information so that others can review your pull request:

i added code cat /opt/frappe/apps.json | jq -r '.[] | "bench get-app --branch " + .branch + " --dev --ignore-apps-file " + .url' | sh; \ to get apps from repo using loop

Explain the details for making this change. What existing problem does the pull request solve?

i changed code if [ -n "${APPS_JSON_BASE64}" ]; then
export APP_INSTALL_ARGS="--apps_path=/opt/frappe/apps.json";
fi &&
to
if [ -n "${APPS_JSON_BASE64}" ]; then
export APP_INSTALL_ARGS="--apps_path=/opt/frappe/apps.json";
cat /opt/frappe/apps.json | jq -r '.[] | "bench get-app --branch " + .branch + " --dev --ignore-apps-file " + .url' | sh;
fi && \ and am updating the docs

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