Refactor Dockerfile #612

Job	Run time
build_portable_windows / Build Portable FFmpeg (win64)	35m 22s
build_portable_linux / Build Portable FFmpeg (amd64)	1h 19m 9s
build_debian / Build FFmpeg (buster, amd64)	51m 48s
build_portable_linux / Build Portable FFmpeg (arm64)	1h 19m 9s
build_ubuntu / Build FFmpeg (focal, amd64)	52m 45s
build_debian / Build FFmpeg (buster, arm64)	15m 48s
build_ubuntu / Build FFmpeg (focal, arm64)	11m 42s
build_debian / Build FFmpeg (buster, armhf)	14m 2s
build_ubuntu / Build FFmpeg (focal, armhf)	11m 20s
build_debian / Build FFmpeg (bullseye, amd64)	48m 42s
build_ubuntu / Build FFmpeg (jammy, amd64)	48m 3s
build_debian / Build FFmpeg (bullseye, arm64)	13m 37s
build_ubuntu / Build FFmpeg (jammy, arm64)	12m 3s
build_debian / Build FFmpeg (bullseye, armhf)	11m 48s
build_ubuntu / Build FFmpeg (jammy, armhf)	10m 37s
build_debian / Build FFmpeg (bookworm, amd64)	56m 16s
build_ubuntu / Build FFmpeg (lunar, amd64)	55m 44s
build_debian / Build FFmpeg (bookworm, arm64)	12m 8s
build_ubuntu / Build FFmpeg (lunar, arm64)	11m 46s
build_debian / Build FFmpeg (bookworm, armhf)	11m 7s
build_ubuntu / Build FFmpeg (lunar, armhf)	11m 9s
build_ubuntu / Build FFmpeg (mantic, amd64)	50m 4s
build_ubuntu / Build FFmpeg (mantic, arm64)	12m 5s
build_ubuntu / Build FFmpeg (mantic, armhf)	11m 58s
build_portable_windows / Publish Portable Release	0s
build_debian / Publish Release	0s
build_ubuntu / Publish Release	0s
build_portable_linux / Publish Portable Release	1s
	12h 8m 13s

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