fix: self-reported version not correct (#387)

The release process was changed after v1.9.1 to use `ldflags` with `-X`
to dynamically set the version in the binary.

This silently failed because with `-X` you can only change the value of
_variables_, not _constants_ but our `providerVersion` was a constant
beforehand. You also need to provide the full import path, and not the
relative path from where you build the binary.

I also changed the default value to "unknown" to better reflect the
value if the binary was not properly built.

.goreleaser.yml

@@ -16,7 +16,7 @@ builds:
       - amd64
     binary: hcloud-cloud-controller-manager
     ldflags:
-      - "-s -w -X hcloud.providerVersion={{ if not .IsSnapshot }}v{{ end }}{{ .Version }}"
+      - "-s -w -X github.com/hetznercloud/hcloud-cloud-controller-manager/hcloud.providerVersion={{ if not .IsSnapshot }}v{{ end }}{{ .Version }}"
 
 archives:
   - id: deployment-yamls

hcloud/cloud.go

@@ -52,9 +52,11 @@ const (
 	hcloudMetricsAddress                     = ":8233"
 	nodeNameENVVar                           = "NODE_NAME"
 	providerName                             = "hcloud"
-	providerVersion                          = "v1.9.1"
 )
 
+// providerVersion is set by the build process using -ldflags -X
+var providerVersion = "unknown"
+
 type cloud struct {
 	client       *hcloud.Client
 	instances    *instances