Renew Docker image to change the base from Alpine to Debian slim, and publish also to GitHub Container Registry

[yhatt]

Marp CLI v4 will introduce brand-new official container image:

• Change base image from Alpine to Debian. Puppeteer has several reports about timeout due to using Alpine Linux as a container: https://github.com/search?q=repo%3Apuppeteer%2Fpuppeteer+timeout+alpine&type=issues. We expect to fix #592 by this change.

• Revert Dockerfile to build Marp CLI from source in the build phase instead of using already built asset. An original change had been introduced in #402, but using multi-stage build with --platform=$BUILDPLATFORM is much better.

• Publish the image into both of Docker Hub and GitHub Container Registry. The image publishing workflow has been moved from CircleCI to GitHub Actions, and it will publish the image into marpteam/marp-cli and ghcr.io/marp-team/marp-cli at the same time. Closes #578.

• The latest state of main branch becomes tagged as main instead of latest from v4. We had treated latest as "the latest including in-development", but it seems to have been actually brought confusion. In v4, latest tag will point the latest release v4.X.X, and in-development latest will become main, same as the branch name.