Add option for docker runtime to provide default volumes

[lafriks]

Fixes #993

Not tested yet, will test once PR docker image is built Tested and works just fine 😊

[woodpecker-bot]

Deployment of preview was successful: https://woodpecker-ci-woodpecker-pr-1203.surge.sh

[codecov-commenter]

Codecov Report

Base: 49.38% // Head: 49.38% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (3680fd9) compared to base (ec9b0a6).
Patch has no changes to coverable lines.

❗ Current head 3680fd9 differs from pull request most recent head 957e864. Consider uploading reports for the commit 957e864 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1203   +/-   ##
=======================================
  Coverage   49.38%   49.38%           
=======================================
  Files          88       88           
  Lines        6624     6615    -9     
=======================================
- Hits         3271     3267    -4     
+ Misses       3158     3153    -5     
  Partials      195      195           

Impacted Files	Coverage Δ
server/shared/procBuilder.go	84.61% <0.00%> (-0.52%)	⬇️
server/logging/log.go	54.65% <0.00%> (+5.81%)	⬆️

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[lafriks]

Tested and confirm working

[6543]

please don't forget to add labels !!!

[anbraten]

In case the variable is not set this wont allow to run pipelines anymore: Error response from daemon: invalid volume specification: ''