Add workflow_dispatch to docker workflow

[noggi]

https://github.com/orgs/community/discussions/58022

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Unit Test Results (build & test)

0 tests   - 63   0 :heavy_check_mark:  - 63   0s :stopwatch: -3s 0 suites  -   1   0 :zzz: ±  0  0 files    -   1   0 :x: ±  0 

Results for commit 11b2f2e0. ± Comparison against base commit 3225c876.