Use Node.js 18+ for Timgen

[jirik]

There is PR #756 (currently branch https://github.com/LayerManager/layman/tree/preserve--map-timgen-fails2) that tries to use Node.js v18 for Timgen. It works on desktop, but not on GitHub Actions. Not sure why.

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Some maps contain WMS layer that is running on domain without TLS1.3 support (e.g. https://geoportal.kraj-lbc.cz/ ). Node.js since v17 uses OpenSSL 3 that does not communicate with https://geoportal.kraj-lbc.cz/ well by default. See

• https://stackoverflow.com/a/74600467
• https://stackoverflow.com/questions/71603314/ssl-error-unsafe-legacy-renegotiation-disabled
• EPROTO C0BAF076:error:0A000152 error reported in PM2 log from this version nodejs/node#45378

Solution is to enable SSL_OP_LEGACY_SERVER_CONNECT that is disabled by default. It works on local desktop, but not on GitHub Actions

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How to enable it for curl: https://bugs.launchpad.net/ubuntu/+source/openconnect/+bug/1968467

[jirik]

Successor of #755

[jirik]

Tried in #756

[jirik]

It can be probably fixed by enabling not-so-secure SSL communication (UnsafeLegacyRenegotiation), see #966.

We can e.g. add /code/unsafe_openssl.cnf file to Timgen container and activate it by NODE_OPTIONS in test environment and optionally in other environments.