feat: Add user scoped git ssh keys (#834)

coderd/database/queries/gitsshkeys.sql

@@ -0,0 +1,35 @@
+-- name: InsertGitSSHKey :one
+INSERT INTO
+	gitsshkeys (
+		user_id,
+		created_at,
+		updated_at,
+		private_key,
+		public_key
+	)
+VALUES
+	($1, $2, $3, $4, $5) RETURNING *;
+
+-- name: GetGitSSHKey :one
+SELECT
+	*
+FROM
+	gitsshkeys
+WHERE
+	user_id = $1;
+
+-- name: UpdateGitSSHKey :exec
+UPDATE
+	gitsshkeys
+SET
+	updated_at = $2,
+	private_key = $3,
+	public_key = $4
+WHERE
+	user_id = $1;
+
+-- name: DeleteGitSSHKey :exec
+DELETE FROM
+	gitsshkeys
+WHERE
+	user_id = $1;