Fix syntax errors in shell scripts

scripts/deploy-database.sh

@@ -6,7 +6,7 @@
 
 interactive=true
 
-if [ "$1" == "--no-interactive" ]; then
+if [ "$1" = "--no-interactive" ]; then
 	interactive=false
 fi
 
@@ -21,7 +21,7 @@ sudo systemctl enable postgresql.service
 # Create databse and user
 #
 
-if [ "$interactive" == "true" ]; then
+if [ "$interactive" = "true" ]; then
 	sudo -u postgres -- createuser -P kemal
 	sudo -u postgres -- createdb -O kemal invidious
 else

scripts/install-dependencies.sh

@@ -74,7 +74,7 @@ install_apt() {
 	sudo apt-get install --yes --no-install-recommends \
 		libssl-dev libxml2-dev libyaml-dev libgmp-dev libevent-dev \
 		libpcre3-dev libreadline-dev libsqlite3-dev zlib1g-dev \
-		crystal postgres git librsvg2-bin make
+		crystal postgresql-13 git librsvg2-bin make
 }
 
 install_yum() {