docker: fix/improve support for persistent configurations (#1915)

[mmetc]

• set all defaults in config.yaml and leave environment variables empty. This way when they are set we know that we must override the values in config.yaml.
• ignore tainted objects when calling install/upgrade/remove
• use_wal is false by default

[codecov-commenter]

Codecov Report

Merging #1922 (fb3eb76) into releases/1.4.x (f2528f3) will decrease coverage by 0.53%.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           releases/1.4.x    #1922      +/-   ##
==================================================
- Coverage           54.07%   53.53%   -0.54%     
==================================================
  Files                 148      148              
  Lines               19991    19991              
==================================================
- Hits                10810    10703     -107     
- Misses               7989     8111     +122     
+ Partials             1192     1177      -15     

Flag	Coverage Δ
func-crowdsec	45.40% <ø> (-10.27%)	⬇️
func-cscli	44.92% <ø> (ø)
unit-linux	58.01% <ø> (-0.04%)	⬇️
unit-windows	53.32% <ø> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
cmd/crowdsec/serve.go	22.34% <0.00%> (-32.58%)	⬇️
cmd/crowdsec/api.go	51.85% <0.00%> (-27.78%)	⬇️
cmd/crowdsec/crowdsec.go	43.97% <0.00%> (-1.58%)	⬇️
cmd/crowdsec/main.go	62.94% <0.00%> (-1.02%)	⬇️
pkg/acquisition/modules/cloudwatch/cloudwatch.go	77.49% <0.00%> (-1.00%)	⬇️
pkg/leakybucket/manager_run.go	68.43% <0.00%> (+1.41%)	⬆️

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[mmetc]

/kind fix