MacOS qt6 Docker files

[e1z0]

MacOS ARM64+AMD64 qt6.7 docker files

[mappu]

Fixes: #210

I tried this out today using examples/helloworld6:

• miqt-docker ffmpeg-macos-cross-x86_64-sdk14.5-go1.25-qt6.7-dynamic go build -ldflags '-s -w'
  • Docker container built successfully. Building the docker container for the first time took 839s on my PC
  • Building the app succeeded with no warnings
  • helloworld6: Mach-O 64-bit x86_64 executable
• miqt-docker ffmpeg-macos-cross-arm64-sdk14.5-go1.25-qt6.7-dynamic go build -ldflags '-s -w'
  • Docker container built successfully. Building the docker container for the first time took 489s on my PC
  • Building the app succeeded with no warnings
  • helloworld6: Mach-O 64-bit arm64 executable

Everything worked perfectly! Thank you for the contribution @e1z0 ! 🎉