Fix OTLP collector wiring, workflow permissions, Node 20 and tool caching (#1785-#1788) - #1809

buildx failed with: ERROR: failed to build: invalid tag "ghcr.io/solutions-plug/predictiq:-ff32e03": invalid reference format

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/