Require elixir>=1.15 in dockerfiles #10390

Job	Run time
Check common misspellings	16s
Elixir dependencies	21s
Generate project documentation	0s
Npm dependencies	21s
Check if the regression test criteria are met, store in the job output	1s
Rebuild main branch dependencies	11s
Npm E2E dependencies	15s
Run FE tests	2m 22s
Chromatic deployment	2m 24s
API bc check (V1)	22s
API bc check (V2)	29s
Test	1m 14s
Static Code Analysis	4m 20s
End to end tests	12m 39s
Regression tests	0s
Build the docker image for the demo environment	0s
Commit to OBS to generate RPM package	0s
Commit to OBS to generate container image	0s
Build and push container images	0s
Deploy updated images to the demo environment	0s
Use photofinish to push mock data to the demo environment	0s
	25m 15s

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