Docker image info to local runner

[gordonwatts]

• Added Metadata to request a docker image when running with LocalFile derivatives.
• Updated documentation

Fixes #198

[codecov[bot]]

Codecov Report

Merging #203 (1f14def) into master (37a07c8) will increase coverage by 0.06%. The diff coverage is 100.00%.

:exclamation: Current head 1f14def differs from pull request most recent head 88aab05. Consider uploading reports for the commit 88aab05 to get more accurate results

@@            Coverage Diff             @@
##           master     #203      +/-   ##
==========================================
+ Coverage   95.36%   95.43%   +0.06%     
==========================================
  Files          31       31              
  Lines        1833     1861      +28     
  Branches      241      249       +8     
==========================================
+ Hits         1748     1776      +28     
  Misses         53       53              
  Partials       32       32              

Flag	Coverage Δ
unittests	95.43% <100.00%> (+0.06%)	:arrow_up:

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

Impacted Files	Coverage Δ
func_adl_xAOD/common/executor.py	100.00% <100.00%> (ø)
func_adl_xAOD/common/local_dataset.py	100.00% <100.00%> (ø)
func_adl_xAOD/common/meta_data.py	99.23% <100.00%> (+0.03%)	:arrow_up:

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