Improvements and PDF export for Docker Training

[elft3r]

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[github-actions]

Preview Deployment

This PR has been deployed for preview:

Presentation	URL	Commit
cloud-migrations	https://ba1551bb.presentations-15u.pages.dev/cloud-migrations/	9e8368b
docker-training	https://ba1551bb.presentations-15u.pages.dev/docker-training/	9e8368b
secure-landing-zones	https://ba1551bb.presentations-15u.pages.dev/secure-landing-zones/	9e8368b

Last updated: Wed, 03 Jun 2026 20:52:18 GMT

[Copilot]

Pull request overview

This PR updates the Docker Training presentation content while adding support for more reliable PDF/print export rendering (via DeckTape and export-specific styling safeguards).

Changes:

• Add DeckTape as an npm dependency to support PDF export workflows.
• Introduce a PDF/print export safeguard that disables blur-based shadows during export contexts to avoid Chromium rasterization artifacts.
• Refresh Docker Training slides (resources links, starter link, command examples) and update the shared speaker bio entries.

Reviewed changes

Copilot reviewed 7 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
shared/sections/jochen.html	Updates the shared speaker bio list items and adds “former” badges for past roles.
shared/portrait.js	Adds an export-detection hook that tags the document for export-only CSS adjustments.
package.json	Adds decktape dependency for PDF export tooling.
package-lock.json	Locks DeckTape (and transitive) dependencies for reproducible installs.
docker-training/sections/resources.html	Reformats and updates resource links (notably the Play-with-Docker and kickstart URLs).
docker-training/sections/docker-time.html	Updates the kickstart link target and formatting.
docker-training/sections/docker-commands.html	Refreshes and reorganizes command examples (system/container/image subcommands).
custom-themes/white_contrast_compact_verbatim_headers.css	Adds export-context CSS to neutralize shadows during PDF/print generation.

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