fix(release): fetch tags first (#201)

Fetches tags in the release pipeline so the versions reported by `tk
--version` are actually semvers, not commit hashes

Author: sh0rez

.drone/drone.jsonnet

@@ -1,4 +1,4 @@
-local golang = 'golang:1.12';
+local golang = 'golang:1.13';
 
 local volumes = [{ name: 'gopath', temp: {} }];
 local mounts = [{ name: 'gopath', path: '/go' }];
@@ -65,6 +65,7 @@ local docker(arch) = pipeline('docker-' + arch) {
 
   pipeline('release') {
     steps: [
+      go('fetch-tags', ['git fetch origin --tags']),
       make('cross'),
       {
         name: 'publish',

.drone/drone.yml

@@ -8,15 +8,15 @@ platform:
 
 steps:
 - name: download
-  image: golang:1.12
+  image: golang:1.13
   commands:
   - go mod download
   volumes:
   - name: gopath
     path: /go
 
 - name: lint
-  image: golang:1.12
+  image: golang:1.13
   commands:
   - make lint
   volumes:
@@ -26,7 +26,7 @@ steps:
   - download
 
 - name: test
-  image: golang:1.12
+  image: golang:1.13
   commands:
   - make test
   volumes:
@@ -48,8 +48,16 @@ platform:
   arch: amd64
 
 steps:
+- name: fetch-tags
+  image: golang:1.13
+  commands:
+  - git fetch origin --tags
+  volumes:
+  - name: gopath
+    path: /go
+
 - name: cross
-  image: golang:1.12
+  image: golang:1.13
   commands:
   - make cross
   volumes:
@@ -86,7 +94,7 @@ platform:
 
 steps:
 - name: static
-  image: golang:1.12
+  image: golang:1.13
   commands:
   - make static
   volumes:
@@ -127,7 +135,7 @@ platform:
 
 steps:
 - name: static
-  image: golang:1.12
+  image: golang:1.13
   commands:
   - make static
   volumes:
@@ -168,7 +176,7 @@ platform:
 
 steps:
 - name: static
-  image: golang:1.12
+  image: golang:1.13
   commands:
   - make static
   volumes: