feat: Add qTox wasm builder docker image. #591

Job	Run time
build (alpine-s390x)	13s
build (bazel)	1m 51s
build (compcert)	15s
build (doxygen)	13s
buildfarm (server)	14s
build (flutter-web)	14s
buildfarm (worker)	9s
build (frama-c)	15s
build (freebsd)	16s
qtox-host-qt (6.2.4)	16s
build (haskell)	13s
qtox-host-qt (6.8.1)	16s
build (pkgsrc)	14s
qtox-android (armeabi-v7a, debug, 6.2.4)	15s
qtox (alpine)	16s
qtox-android (armeabi-v7a, debug, 6.8.1)	14s
qtox (alpine-appimage)	1m 21s
qtox-android (armeabi-v7a, release, 6.2.4)	22s
qtox (alpine-static)	25s
qtox-android (armeabi-v7a, release, 6.8.1)	14s
qtox (debian)	46s
qtox-android (arm64-v8a, debug, 6.2.4)	24s
qtox (fedora)	52s
qtox-android (arm64-v8a, debug, 6.8.1)	15s
qtox (flatpak-builder)	17s
qtox-android (arm64-v8a, release, 6.2.4)	17s
qtox (ubuntu-lts)	42s
qtox-android (arm64-v8a, release, 6.8.1)	16s
qtox (wasm-builder)	58s
qtox (windows-builder.i686)	52s
qtox (windows-builder.x86_64)	52s
	14m 17s

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