allow non default kubeconfig (#182)

* allo non default kubeconfig
* issue link

Author: yuval-k

changelog/v0.5.10/kubeconfig.yaml

@@ -0,0 +1,4 @@
+changelog:
+  - type: NEW_FEATURE
+    description: Allow using a custom kubeconfig
+    issueLink: https://github.com/solo-io/squash/issues/182

ci/internal/extconfig/dev.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"strings"
 
 	"github.com/solo-io/go-utils/contextutils"
 )
@@ -17,7 +18,7 @@ func MustCreateDevResources(ctx context.Context, version string) {
 		Win32:  MustDownloadSha(ctx, version, osShaIdWin32),
 	}
 	squashSpec := SquashSpec{
-		Version:  version,
+		Version:  strings.TrimPrefix(version, "v"),
 		BaseName: extensionBaseName,
 		Binaries: bins,
 	}