Fix Docker build pipeline matrix variable references in desktop-container-publish.yml

[Copilot]

The Docker build pipeline for desktop containers was failing with an invalid tag format error:

ERROR: failed to build: invalid tag "ghcr.io/owasp/wrongsecrets/:master": invalid reference format

The root cause was incorrect matrix variable references in the desktop-container-publish.yml workflow. The matrix is defined with a container key containing an array of objects:

strategy:
  matrix:
    container:
      - name: "webdesktop"
        dockerfile: "Dockerfile_webdesktop"
        image_name: "wrongsecrets-desktop"
      - name: "webdesktop-k8s"
        dockerfile: "Dockerfile_webdesktopk8s"
        image_name: "wrongsecrets-desktop-k8s"

However, the workflow was using matrix.image_name instead of matrix.container.image_name, causing the variable to be undefined and resulting in malformed Docker tags like ghcr.io/owasp/wrongsecrets/:master.

Changes made:

• Fixed matrix.image_name → matrix.container.image_name
• Fixed matrix.dockerfile → matrix.container.dockerfile
• Fixed matrix.name → matrix.container.name

Before: ghcr.io/OWASP/wrongsecrets/ + undefined + :master → ghcr.io/owasp/wrongsecrets/:master ❌

After: ghcr.io/OWASP/wrongsecrets/wrongsecrets-desktop:master ✅

The fix ensures proper Docker image naming for both the wrongsecrets-desktop and wrongsecrets-desktop-k8s container variants.

Fixes #2228.

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