Add support for multiple SSH public keys

Attaching more than one SSH public key to the same account is useful,
e.g. if one uses different machines to access the AUR SSH interface.
Multiple keys can now be specified by adding multiple lines to the text
area on the account edit form.

Implements FS#45469.

Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>
Acked-by: Leonidas Spyropoulos <artafinde@gmail.com>

schema/aur-schema.sql

@@ -33,7 +33,6 @@ CREATE TABLE Users (
 	LangPreference VARCHAR(5) NOT NULL DEFAULT 'en',
 	IRCNick VARCHAR(32) NOT NULL DEFAULT '',
 	PGPKey VARCHAR(40) NULL DEFAULT NULL,
-	SSHPubKey VARCHAR(4096) NULL DEFAULT NULL,
 	LastLogin BIGINT UNSIGNED NOT NULL DEFAULT 0,
 	LastLoginIPAddress INTEGER UNSIGNED NOT NULL DEFAULT 0,
 	InactivityTS BIGINT UNSIGNED NOT NULL DEFAULT 0,
@@ -53,6 +52,17 @@ INSERT INTO Users (ID, AccountTypeID, Username, Email, Passwd) VALUES (
 	3, 1, 'user', 'user@localhost', MD5('user'));
 
 
+-- SSH public keys used for the aurweb SSH/Git interface.
+--
+CREATE TABLE SSHPubKeys (
+	UserID INTEGER UNSIGNED NOT NULL,
+	Fingerprint VARCHAR(44) NOT NULL,
+	PubKey VARCHAR(4096) NOT NULL,
+	PRIMARY KEY (Fingerprint),
+	FOREIGN KEY (UserID) REFERENCES Users(ID) ON DELETE CASCADE
+) ENGINE = InnoDB;
+
+
 -- Track Users logging in/out of AUR web site.
 --
 CREATE TABLE Sessions (