docs: k8s credentials

[florian-hoenicke]

As discovered by @cristianmtr there is a manual extra-step involved when running the test. The password has to be inserted manually into the script.
This hands over the password via environment variable.

[codecov]

Codecov Report

Merging #3602 (c038ccb) into master (add58f5) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3602      +/-   ##
==========================================
- Coverage   89.55%   89.42%   -0.13%     
==========================================
  Files         154      154              
  Lines       11542    11542              
==========================================
- Hits        10337    10322      -15     
- Misses       1205     1220      +15     

Flag	Coverage Δ
daemon	45.09% <ø> (+0.01%)	⬆️
jina	88.64% <ø> (-0.09%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
jina/peapods/peas/__init__.py	85.89% <0.00%> (-4.49%)	⬇️
jina/peapods/runtimes/jinad/__init__.py	87.96% <0.00%> (-3.71%)	⬇️
jina/clients/base/http.py	96.49% <0.00%> (-1.76%)	⬇️
jina/peapods/pods/k8s.py	78.57% <0.00%> (-1.69%)	⬇️
jina/peapods/pods/compound.py	82.71% <0.00%> (-1.24%)	⬇️
jina/peapods/pods/k8slib/kubernetes_tools.py	90.69% <0.00%> (-1.17%)	⬇️
jina/helper.py	82.76% <0.00%> (-0.36%)	⬇️
jina/clients/base/__init__.py	92.42% <0.00%> (+1.51%)	⬆️
jina/peapods/runtimes/container/__init__.py	81.92% <0.00%> (+1.80%)	⬆️
jina/importer.py	87.17% <0.00%> (+2.56%)	⬆️

---

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[github-actions]

Latency summary

Current PR yields:

• 🐢🐢 index QPS at 1241, delta to last 2 avg.: -13%
• 🐢🐢 query QPS at 54, delta to last 2 avg.: -12%
• 🐢🐢 dam extend QPS at 42856, delta to last 2 avg.: -25%
• 🐢🐢 avg flow time within 1.7001 seconds, delta to last 2 avg.: +25%
• 🐎🐎🐎🐎 import jina within 0.4854 seconds, delta to last 2 avg.: +34%

Breakdown

Version	Index QPS	Query QPS	DAM Extend QPS	Avg Flow Time (s)	Import Time (s)
current	1241	54	42856	1.7001	0.4854
2.1.5	1440	63	56211	1.3144	0.3664
2.1.4	1442	60	59262	1.3938	0.3572

Backed by latency-tracking. Further commits will update this comment.