Split the binary build (#985)

As we can not compile darwin binaries with static flags I have split the
build process into different make tasks. Now we get static linked
binaries especially for linux so that it also can run on older versions
of CenOS and so on.

Signed-off-by: Thomas Boerger <thomas@webhippie.de>

.drone.yml

@@ -11,8 +11,7 @@ pipeline:
     image: webhippie/golang:edge
     pull: true
     environment:
-      CGO_ENABLED: 1
-      TAGS: sqlite bindata
+      TAGS: bindata sqlite
       GOPATH: /srv/app
     commands:
       - apk -U add openssh-client
@@ -29,8 +28,7 @@ pipeline:
     image: webhippie/golang:edge
     pull: true
     environment:
-      CGO_ENABLED: 1
-      TAGS: sqlite bindata
+      TAGS: bindata
       GOPATH: /srv/app
     commands:
       - make test-mysql
@@ -41,20 +39,31 @@ pipeline:
     image: webhippie/golang:edge
     pull: true
     environment:
-      CGO_ENABLED: 1
-      TAGS: sqlite bindata
+      TAGS: bindata
       GOPATH: /srv/app
     commands:
       - make test-pgsql
     when:
       event: [ push, tag, pull_request ]
 
-  updater:
+  static:
     image: karalabe/xgo-latest:latest
     pull: true
     environment:
-      CGO_ENABLED: 1
-      TAGS: sqlite bindata
+      TAGS: bindata
+      FLAVOR: static
+      GOPATH: /srv/app
+    commands:
+      - make release
+    when:
+      event: [ push, tag, pull_request ]
+
+  sqlite:
+    image: karalabe/xgo-latest:latest
+    pull: true
+    environment:
+      TAGS: bindata sqlite
+      FLAVOR: sqlite
       GOPATH: /srv/app
     commands:
       - make release