fix: extracting docker image name for scan correctly

[freemanzMrojo]

Description

The step to extract the Docker image name was wrong for cases when there was more than one value.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Using the SDK pipeline

Test Configuration:

• Node.js Version: 20.18.0
• Yarn Version: 1.22.19

Checklist:

• My code follows the coding standards of this project
• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• New and existing integration tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have not added any vulnerable dependencies to my code

[github-actions]

Test Coverage

Summary

Lines	Statements	Branches	Functions
	98.99% (4334/4378)	97.61% (1390/1424)	99% (891/900)

Title	Tests	Skipped	Failures	Errors	Time
core	810	0 💤	0 ❌	0 🔥	2m 18s ⏱️
network	726	0 💤	0 ❌	0 🔥	4m 53s ⏱️
errors	42	0 💤	0 ❌	0 🔥	16.599s ⏱️
logging	3	0 💤	0 ❌	0 🔥	18.776s ⏱️
hardhat-plugin	19	0 💤	0 ❌	0 🔥	57.745s ⏱️
aws-kms-adapter	23	0 💤	0 ❌	0 🔥	1m 24s ⏱️
ethers-adapter	5	0 💤	0 ❌	0 🔥	1m 12s ⏱️
rpc-proxy	37	0 💤	0 ❌	0 🔥	1m 5s ⏱️