fix: add cover for spark article

[lepiaf]

No description provided.

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 88.3%, saving 890.86 KB.

Filename	Before	After	Improvement	Visual comparison
_assets/articles/2024-07-08-demarrer-apache-spark/cover.webp	1,008.87 KB	118.01 KB	-88.3%	View diff

1201 images did not require optimisation.

[github-actions]

⚡️🏠 Lighthouse report

Here's the summary:

Path	Performance	Accessibility	Best practices	SEO	PWA
/fix-cover-article-spark-bis/	🟢 90	🟢 90	🟢 100	🟢 92	🟠 70
/fix-cover-article-spark-bis/fr/authors/ajacquemin/	🟠 71	🟢 90	🟢 100	🟢 92	🟠 70
/fix-cover-article-spark-bis/fr/comment-construire-site-web-avec-nextjs/	🟠 76	🟠 80	🟢 100	🟢 100	🟠 70
/fix-cover-article-spark-bis/fr/nestjs-le-cycle-de-vie-dune-requete/	🟠 73	🟠 80	🟢 100	🟢 97	🟠 70

Here's the audits:

Path	FCP 1800 <=	LCP 2500 <=	Speed Index 3400 <=	TTI 3800 <=	TBT 200 <=	CLS 0.1 <=
/fix-cover-article-spark-bis/	🔴 2253	🟢 2465	🟢 2253	🔴 4220	🟢 19	🔴 0.12
/fix-cover-article-spark-bis/fr/authors/ajacquemin/	🔴 2436	🟢 2436	🟢 2745	🔴 4215	🟢 16	🟢 0.01
/fix-cover-article-spark-bis/fr/comment-construire-site-web-avec-nextjs/	🔴 2426	🔴 2604	🟢 2426	🔴 4142	🟢 10	🟢 0.03
/fix-cover-article-spark-bis/fr/nestjs-le-cycle-de-vie-dune-requete/	🔴 1978	🟢 1978	🟢 2407	🔴 4127	🟢 13	🟢 0.04

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 3.2%, saving 3.72 KB.

Filename	Before	After	Improvement	Visual comparison
_assets/articles/2024-07-08-demarrer-apache-spark/cover.webp	118.01 KB	114.28 KB	-3.2%	View diff

1201 images did not require optimisation.

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 50%, saving 732.11 KB.

Filename	Before	After	Improvement	Visual comparison
_assets/articles/2024-07-08-demarrer-apache-spark/cover.jpg	1.43 MB	732.05 KB	-50.0%	View diff

1201 images did not require optimisation.