Previously, in order to remain as deterministic as possible, the
Dockerfile for the preview server Docker image had all dependencies
pinned to specific versions. It turns out that some packages (such as
`nginx`, `nodejs`, and `openssl` - potentially others too) make older
versions unavailable on the repositories once a newer version is
available.
See for example:
- https://github.com/nodesource/distributions/issues/33
- https://askubuntu.com/questions/715104/how-can-i-downgrade-openssl-via-apt-get
This commit, therefore, removes the exact versions for these packages.
The latest versions will be installed everytime the Docker image is
built (subject to Docker caching).
PR Close#36837
293557c80b