feat: go:embed static assets (#1733)

* feat: go:embed static assets

Go 1.16 introduced the ability to embed files within a generated binary directly with the go tool chain. This simplifies our dependencies and the significantly improves the development workflow for future developers.

Key points to note:

Due to the inability to embed files that do not reside within the local package we need to duplicate our `config.template.yml` within `internal/configuration`.

To avoid issues with the development workflow empty mock files have been included within `internal/server/public_html`. These are substituted with the respective generated files during the CI/CD and build workflows.

* fix(suites): increase ldap suite test timeout

* fix(server): fix swagger asset CSP

1 files changed, 5 insertions, 11 deletions

diff --git a/internal/authentication/file_user_provider.go b/internal/authentication/file_user_provider.go
index 3a42290c0..7a11c2c42 100644
--- a/internal/authentication/file_user_provider.go
+++ b/internal/authentication/file_user_provider.go
@@ -1,6 +1,7 @@
 package authentication
 
 import (
+	_ "embed" // Embed users_database.template.yml.
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -102,18 +103,11 @@ func checkDatabase(path string) []error {
 	return nil
 }
 
-func generateDatabaseFromTemplate(path string) error {
-	f, err := cfg.Open("users_database.template.yml")
-	if err != nil {
-		return fmt.Errorf("Unable to open users_database.template.yml: %v", err)
-	}
+//go:embed users_database.template.yml
+var cfg []byte
 
-	b, err := ioutil.ReadAll(f)
-	if err != nil {
-		return fmt.Errorf("Unable to read users_database.template.yml: %v", err)
-	}
-
-	err = ioutil.WriteFile(path, b, 0600)
+func generateDatabaseFromTemplate(path string) error {
+	err := ioutil.WriteFile(path, cfg, 0600)
 	if err != nil {
 		return fmt.Errorf("Unable to generate %v: %v", path, err)
 	}