Make release-linux architectures via environments.

[lunny]

Then we can just only release one architecture.

LINUX_ARCHS=linux/amd64 TAGS=bindata make release-linux

[lunny]

It seems xgo don't care about -targets.

$ LINUX_ARCHS=linux/amd64 TAGS=bindata make release-linux
CGO_CFLAGS="-g -O2 -I/Users/lunny/gopath/src/github.com/ibmdb/go_ibm_db/installer/clidriver/include" GO111MODULE=off xgo -go go-1.15.x -dest dist/binaries -tags 'netgo osusergo bindata' -ldflags '-linkmode external -extldflags "-static"  -X "main.MakeVersion=GNU Make 3.81" -X "main.Version=1.14.0+dev-482-ga19bded87" -X "main.Tags=bindata"' -targets 'linux/amd64' -out gitea-master .
Checking docker installation...
Client: Docker Engine - Community
 Version:           18.09.2
 API version:       1.39
 Go version:        go1.10.8
 Git commit:        6247962
 Built:             Sun Feb 10 04:12:39 2019
 OS/Arch:           darwin/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.2
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.6
  Git commit:       6247962
  Built:            Sun Feb 10 04:13:06 2019
  OS/Arch:          linux/amd64
  Experimental:     true

Checking for required docker image techknowlogick/xgo:go-1.15.x... found.
Cross compiling ....
Enabled Go module support
Using vendored Go module dependencies
Building /source/go.mod...
Compiling for linux/amd64...
# code.gitea.io/gitea
loadinternal: cannot find runtime/cgo
Bootstrapping linux/arm-5...
# code.gitea.io/gitea
loadinternal: cannot find runtime/cgo
Bootstrapping linux/arm-5...
Compiling for linux/arm-5...
Compiling for linux/arm-5...
# code.gitea.io/gitea
loadinternal: cannot find runtime/cgo
Cleaning up build environment...

[codecov-io]

Codecov Report

Merging #14184 (a19bded) into master (9a4050f) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #14184   +/-   ##
=======================================
  Coverage   42.02%   42.03%           
=======================================
  Files         733      733           
  Lines       78704    78704           
=======================================
+ Hits        33074    33081    +7     
+ Misses      40199    40194    -5     
+ Partials     5431     5429    -2     

Impacted Files	Coverage Δ
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
models/unit.go	46.57% <0.00%> (-2.74%)	⬇️
routers/repo/view.go	37.60% <0.00%> (-0.65%)	⬇️
services/pull/pull.go	42.35% <0.00%> (-0.51%)	⬇️
models/gpg_key.go	53.90% <0.00%> (+0.57%)	⬆️
modules/git/command.go	89.42% <0.00%> (+1.92%)	⬆️
services/gitdiff/gitdiff.go	70.93% <0.00%> (+1.93%)	⬆️
modules/charset/charset.go	70.78% <0.00%> (+2.24%)	⬆️

---

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[lunny]

It seems xgo don't care about -targets.

$ LINUX_ARCHS=linux/amd64 TAGS=bindata make release-linux
CGO_CFLAGS="-g -O2 -I/Users/lunny/gopath/src/github.com/ibmdb/go_ibm_db/installer/clidriver/include" GO111MODULE=off xgo -go go-1.15.x -dest dist/binaries -tags 'netgo osusergo bindata' -ldflags '-linkmode external -extldflags "-static"  -X "main.MakeVersion=GNU Make 3.81" -X "main.Version=1.14.0+dev-482-ga19bded87" -X "main.Tags=bindata"' -targets 'linux/amd64' -out gitea-master .
Checking docker installation...
Client: Docker Engine - Community
 Version:           18.09.2
 API version:       1.39
 Go version:        go1.10.8
 Git commit:        6247962
 Built:             Sun Feb 10 04:12:39 2019
 OS/Arch:           darwin/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.2
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.6
  Git commit:       6247962
  Built:            Sun Feb 10 04:13:06 2019
  OS/Arch:          linux/amd64
  Experimental:     true

Checking for required docker image techknowlogick/xgo:go-1.15.x... found.
Cross compiling ....
Enabled Go module support
Using vendored Go module dependencies
Building /source/go.mod...
Compiling for linux/amd64...
# code.gitea.io/gitea
loadinternal: cannot find runtime/cgo
Bootstrapping linux/arm-5...
# code.gitea.io/gitea
loadinternal: cannot find runtime/cgo
Bootstrapping linux/arm-5...
Compiling for linux/arm-5...
Compiling for linux/arm-5...
# code.gitea.io/gitea
loadinternal: cannot find runtime/cgo
Cleaning up build environment...

Resolved so that this is ready to review.