Bump docker/metadata-action from 5.4.0 to 5.5.0 (#351) #1356

Job	Run time
Generate project documentation	27s
Rebuild main branch dependencies	2s
Lint checks	14s
Elixir dependencies (Elixir 1.14.3, OTP 25)	16s
Elixir dependencies (Elixir 1.13.4, OTP 22)	12s
API bc check (V1)	24s
API bc check (V2)	33s
Test (Elixir 1.14.3, OTP 25)	43s
Test (Elixir 1.13.4, OTP 22)	37s
Static Code Analysis	3m 2s
Commit the project on OBS	2m 37s
Build and push container images	3m 28s
Build the docker image for the demo environment	3m 30s
	16m 5s

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