✨ feat: Add auth flow (#146)

This adds a simple way to incorporate a centralized authentication flow.

The idea is to have the user, API and SSH (for machine authentication)
all in one place using `openauthjs` + `SST`

We also have a database now :)

> We are using InstantDB as it allows us to authenticate a use with just
the email. Plus it is super simple simple to use _of course after the
initial fumbles trying to design the db and relationships_

packages/cli/internal/resource/resource.go

@@ -0,0 +1,38 @@
+package resource
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"reflect"
+)
+
+type resource struct {
+	Api struct {
+		Url string `json:"url"`
+	}
+	Auth struct {
+		Url string `json:"url"`
+	}
+	AuthFingerprintKey struct {
+		Value string `json:"value"`
+	}
+}
+
+var Resource resource
+
+func init() {
+	val := reflect.ValueOf(&Resource).Elem()
+	for i := 0; i < val.NumField(); i++ {
+		field := val.Field(i)
+		typeField := val.Type().Field(i)
+		envVarName := fmt.Sprintf("SST_RESOURCE_%s", typeField.Name)
+		envValue, exists := os.LookupEnv(envVarName)
+		if !exists {
+			panic(fmt.Sprintf("Environment variable %s is required", envVarName))
+		}
+		if err := json.Unmarshal([]byte(envValue), field.Addr().Interface()); err != nil {
+			panic(err)
+		}
+	}
+}