Dockerfile

FROM crystallang/crystal:1.0.0-alpine
COPY . /src
WORKDIR /src
RUN crystal build --static test.cr

FROM golang:alpine
RUN go get -u github.com/vishen/go-chromecast

FROM scratch
COPY --from=0 /src/test /bin/test
COPY --from=1 /go/bin/go-chromecast /bin
ENV PATH=/bin
ENTRYPOINT ["/bin/test"]

gistfile1.txt

┌─[erdnaxeli@videl:~/bacasable/test]-[22:26:17]
└─>$ docker build -t test --network=host .
Sending build context to Docker daemon  3.072kB
Step 1/11 : FROM crystallang/crystal:1.0.0-alpine
 ---> d090bf999fa4
Step 2/11 : COPY . /src
 ---> d25393145b70
Step 3/11 : WORKDIR /src
 ---> Running in c51d4d13dc4c
Removing intermediate container c51d4d13dc4c
 ---> bdba34ab9314
Step 4/11 : RUN crystal build --static test.cr
 ---> Running in 6f9de44b4e86
Removing intermediate container 6f9de44b4e86
 ---> 574949b91bd4
Step 5/11 : FROM golang:alpine
 ---> 270727b8fd0f
Step 6/11 : RUN go get -u github.com/vishen/go-chromecast
 ---> Using cache
 ---> c32a5ef9c930
Step 7/11 : FROM scratch
 ---> 
Step 8/11 : COPY --from=0 /src/test /bin/test
 ---> Using cache
 ---> 0790736674a9
Step 9/11 : COPY --from=1 /go/bin/go-chromecast /bin
 ---> Using cache
 ---> 6af0a8ee7e74
Step 10/11 : ENV PATH=/bin
 ---> Using cache
 ---> 5e271cf7d2db
Step 11/11 : ENTRYPOINT ["/bin/test"]
 ---> Using cache
 ---> 56ad39918111
Successfully built 56ad39918111
Successfully tagged test:latest

┌─[erdnaxeli@videl:~/bacasable/test]-[22:26:24]
└─>$ docker run --rm --init test
File.exists?(bin) # => true
File.executable?(bin) # => true
File.info?(bin) # => Crystal::System::FileInfo(
 @stat=
  LibC::Stat(
   @__pad0=0,
   @__unused=StaticArray[0, 0, 0],
   @st_atim=LibC::Timespec(@tv_nsec=0, @tv_sec=1619162376),
   @st_blksize=4096,
   @st_blocks=38672,
   @st_ctim=LibC::Timespec(@tv_nsec=254242017, @tv_sec=1619209538),
   @st_dev=56,
   @st_gid=0,
   @st_ino=817248,
   @st_mode=33261,
   @st_mtim=LibC::Timespec(@tv_nsec=0, @tv_sec=1619162376),
   @st_nlink=1,
   @st_rdev=0,
   @st_size=19798760,
   @st_uid=0))
(File.read(bin))[..10] # => "\u007FELF\u0002\u0001\u0001\u0000\u0000\u0000\u0000"
Unhandled exception: Error executing process: '/bin/go-chromecast': No such file or directory (File::NotFoundError)
  from usr/share/crystal/src/crystal/system/unix/process.cr:223:7 in 'raise_exception_from_errno'
  from usr/share/crystal/src/crystal/system/unix/process.cr:156:9 in 'spawn'
  from usr/share/crystal/src/process.cr:229:5 in 'initialize'
  from usr/share/crystal/src/process.cr:221:3 in 'new'
  from usr/share/crystal/src/process.cr:140:5 in '__crystal_main'
  from usr/share/crystal/src/crystal/main.cr:110:5 in 'main_user_code'
  from usr/share/crystal/src/crystal/main.cr:96:7 in 'main'
  from usr/share/crystal/src/crystal/main.cr:119:3 in 'main'
  from src/env/__libc_start_main.c:94:2 in 'libc_start_main_stage2'

test.cr

bin = Process.find_executable("go-chromecast")
if bin
  pp! File.exists?(bin)
  pp! File.executable?(bin)
  pp! File.info?(bin)
  pp! File.read(bin)[..10]
  Process.run(bin) { |p| p.output.each_line { |l| puts l } }
end