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Update node:12.21.0-slim Docker digest to 718e6d6

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Update node:12.21.0-alpine Docker digest to 81eec5b

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Update node:12.21.0-slim Docker digest to c9d40aa

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Update node:12.21.0-alpine Docker digest to 5d8b181

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Update node:12.21.0-alpine Docker digest to cfc5f99

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Update node Docker tag to v12.21.0

Signed-off-by: Renovate Bot <bot@renovateapp.com>

Point to HedgeDoc release notes in hackmd section

Signed-off-by: Hugo Peixoto <hugo.peixoto@gmail.com>

README: Add link to configuration docs

It took me a while to find this document. I think it's good to link to it from the README.
Signed-off-by: Danilo Bargen <mail@dbrgn.ch>

Update node:12.20.1-slim Docker digest to 02084a8

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Update node:12.20.1-slim Docker digest to cf98766

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Add database migration hints for 1.6 -> 1.7 upgrade (fixes #141)

Update node:12.20.1-slim Docker digest to c9cb3f0

Update node:12.20.1-alpine Docker digest to 41ae2b3

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Due to changed default database credentials and database name in
`docker-compose.yml`, a previous installation needs to be migrated in
order to work with the new defaults.
Signed-off-by: Nicolas Dietrich <nidi@mailbox.org>

Signed-off-by: David Mehren <git@herrmehren.de>

Update node:12.20.1-slim Docker digest to 4a5d117

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Update node Docker tag to v12.20.1

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Split dockerfiles into stages

This improves caching and readability without compromising the final
image size.
Signed-off-by: Hugo Peixoto <hugo.peixoto@gmail.com>

This patch should help to ensure that there is always an up-to-date
nightly build.

During release 1.7.1 the official release was containing more recent
changes than the latest nightly. This is an undesierable situation,
which this patch should fix by adding "on push" as trigger for the
nightly action.

This patch adds a "lateset"-like tag to the build to simplify continous
deployment setups, such as our demo instance.

Signed-off-by: David Mehren <git@herrmehren.de>

Update quay.io/hedgedoc/hedgedoc Docker tag to v1.7.0

Signed-off-by: Renovate Bot <bot@renovateapp.com>

Signed-off-by: David Mehren <git@herrmehren.de>