Add secrets support (#14)

database/db.go

@@ -95,7 +95,7 @@ CREATE TABLE version (
 
 );
 
-CREATE TABLE credentials (
+CREATE TABLE clone_credentials (
 	id		  UUID PRIMARY KEY,
 	name      TEXT NOT NULL,
     type      TEXT NOT NULL,
@@ -104,15 +104,34 @@ CREATE TABLE credentials (
 );
 
 CREATE TABLE pipelines (
-    id             UUID PRIMARY KEY,
-    name           TEXT NOT NULL,
-    url            TEXT NOT NULL,
-    poll_interval  INTEGER,
-	credential     UUID DEFAULT NULL,
+    id                    UUID PRIMARY KEY,
+    name                  TEXT NOT NULL,
+    url                   TEXT NOT NULL,
+    poll_interval         INTEGER,
+    clone_credential      UUID DEFAULT NULL,
 
-    CONSTRAINT fk_credential
-        FOREIGN KEY(credential)
-            REFERENCES credentials(id)
+    CONSTRAINT fk_clone_credential
+        FOREIGN KEY(clone_credential)
+            REFERENCES clone_credentials(id)
+);
+
+CREATE TABLE secrets (
+	id	   UUID PRIMARY KEY,
+    name   TEXT NOT NULL UNIQUE,
+    secret TEXT NOT NULL
+);
+
+CREATE TABLE pipeline_secret_mappings (
+    pipeline    UUID NOT NULL,
+	secret      UUID NOT NULL,
+
+    CONSTRAINT fk_pipeline
+        FOREIGN KEY(pipeline)
+            REFERENCES pipelines(id),
+
+    CONSTRAINT fk_secret
+        FOREIGN KEY(secret)
+            REFERENCES secrets(id)
 );
 
 CREATE TABLE webhooks (