Feature: Add support for ARM64

[AdrianCarreno]

This pull request includes changes to Dockerfiles to improve consistency and compatibility across different architectures. The most important change is the modification of the symbolic links in openssl.dockerfile.

Changes to nginx.dockerfile:

• Standardized the FROM statements to use uppercase AS for consistency. (nginx.dockerfile, nginx.dockerfileL5-R13)

Changes to openssl.dockerfile:

• Updated symbolic links to use $(uname -m) for better compatibility across different system architectures. (openssl.dockerfile, openssl.dockerfileL33-R34)

Credit to @Ner0ls for coming up with the idea.