build: attempt to create release from a Docker container (#6)

.gitea/scripts/ci.sh

@@ -2,6 +2,10 @@
 
 set -e
 
+echo "Downloading dependencies"
+apt-get update > /dev/null 2>&1
+apt-get install -y build-essential software-properties-common > /dev/null 2>&1
+
 # setup
 mkdir build
 cd build