chore: Build and test all configs for daily scheduled run (#5801)

This change re-enables building and testing all configurations, but only for the daily scheduled run. Previously all configurations were run for each merge into the develop branch, but that overwhelmed both the GitHub runners and the Conan remote, and thus they were limited to just a subset of configurations. Now that the number of jobs is limited via `max-parallel: 10`, we should be able to safely enable building all configurations again. However, building them all once a day instead of for each PR merge should be sufficient.

Author: bthomee

.github/workflows/on-trigger.yml

@@ -80,6 +80,6 @@ jobs:
         os: [linux, macos, windows]
     with:
       os: ${{ matrix.os }}
-      strategy_matrix: "minimal"
+      strategy_matrix: ${{ github.event_name == 'schedule' && 'all' || 'minimal' }}
     secrets:
       codecov_token: ${{ secrets.CODECOV_TOKEN }}