Integration test with image comparison

[mammatus95]

To ensure that plot result did not change when new code is committed or a new libary is used,
proper image testing is needed.

Source:
https://matplotlib.org/stable/api/testing_api.html

[mammatus95]

[Pipeline] sh ([hide](http://localhost:8080/job/HodographMaps_Run/9/console#))
+ ./run_script.sh 12


Hodograph Maps Run Script
Version: 0.1

Configurations:
Model run: 00z
Leadtime: 12z
Today Date:  31.07.2024


Start downloading leadtime 012h
Plot Hodograph Maps
done with leadtime 012h on Mi 31. Jul 12:57:46 CEST 2024
mv: cannot stat './src/images/*12.png': No such file or directory
ls: cannot access './results_img/*12.png': No such file or directory

[mammatus95]

Matplotlib testing:

img1 = "./baseline/plot.png"
img2 = "./output/plot.png"
compare_images(img1, img2, 0.001)