Adding h5py to Docker images

[joschkabirk]

Summary

This pull request introduces the following changes

• adds h5py to the Docker images. This might be useful for users who want to plot h5files
• update pipeline such that Docker images are always built, just the push step requires to be on the main branch or on a tag. This way we ensure that the build will not fail after merging a PR

Conformity

• Changelog entry
• Documentation (not affected)

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
puma
histogram.py	191	28	85%	107, 141, 147, 228, 252, 322, 352, 398, 427–455, 510, 516, 567, 606
metrics.py	57	20	65%	40–55, 90–100, 149
plot_base.py	233	37	84%	225, 283, 399, 430, 437, 439, 443, 464, 473–481, 558–561, 632–637, 660, 668–674, 722, 732–742
roc.py	190	12	94%	234, 250, 269, 304, 309–315, 347, 364, 369, 448, 538–539
var_vs_eff.py	242	21	91%	90, 166, 190, 224, 248, 252–253, 322–334, 367, 455, 469, 492, 528–534, 604, 642–643, 654, 664
puma/utils
init.py	23	9	61%	65–105
generate.py	25	20	20%	35–46, 79–94
histogram.py	36	5	86%	145, 147, 149, 171–172
TOTAL	1819	152	92%

Tests	Skipped	Failures	Errors	Time
93	0 💤	0 ❌	0 🔥	28.391s ⏱️