Arm build for docker

[mattdean-digicatapult]

#3 removed the arm build for docker as it was failing with the following error:

#30 103.4 go build "-asmflags=all='-trimpath=/go'" "-gcflags=all='-trimpath=/go'" -ldflags="-X "github.com/ipfs/go-ipfs".CurrentCommit=67220edaa" -o "cmd/ipfs/ipfs" "github.com/ipfs/go-ipfs/cmd/ipfs"
#30 811.0 # github.com/ipfs/go-ipfs/cmd/ipfs
#30 811.0 /usr/local/go/pkg/tool/linux_arm64/link: running gcc failed: exit status 1
#30 811.0 collect2: fatal error: cannot find 'ld'
#30 811.0 compilation terminated.
#30 811.0 
#30 811.2 make: *** [cmd/ipfs/Rules.mk:22: cmd/ipfs/ipfs] Error 2

arm builds should be re-enabled so that arm users can run a natively built image

[jonmattgray]

Fixed by #41?

[dblane-digicatapult]

Bug with the ipfs binary on aarch64, we get a segfault on execution.

ELF Headers all seem to be correct

/dscp-ipfs # readelf -h /usr/local/bin/ipfs 
ELF Header:
  Magic:   7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 
  Class:                             ELF64
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              EXEC (Executable file)
  Machine:                           AArch64
  Version:                           0x1
  Entry point address:               0xde05d0
  Start of program headers:          64 (bytes into file)
  Start of section headers:          71879400 (bytes into file)
  Flags:                             0x0
  Size of this header:               64 (bytes)
  Size of program headers:           56 (bytes)
  Number of program headers:         10
  Size of section headers:           64 (bytes)
  Number of section headers:         45
  Section header string table index: 44