release process: split release.sh into two

This allows the add_cosigner workflow to be done before the website links to new binaries.
(so Emzy or other builders can try to reproduce builds and add signatures before new binaries are fully live)

contrib/upload.sh

@@ -5,9 +5,10 @@
 # - ELECBUILD_UPLOADFROM
 # - SSHUSER
 
-set -e
+set -ex
 
 PROJECT_ROOT="$(dirname "$(readlink -e "$0")")/.."
+CONTRIB="$PROJECT_ROOT/contrib"
 
 if [ -z "$SSHUSER" ]; then
     SSHUSER=thomasv
@@ -15,8 +16,8 @@ fi
 
 cd "$PROJECT_ROOT"
 
-version=$(git describe --tags --abbrev=0)
-echo $version
+VERSION=$(python3 -c "import electrum; print(electrum.version.ELECTRUM_VERSION)")
+echo "$VERSION"
 
 if [ -z "$ELECBUILD_UPLOADFROM" ]; then
     cd "$PROJECT_ROOT/dist"
@@ -30,9 +31,12 @@ fi
 
 sftp -oBatchMode=no -b - "$SSHUSER@uploadserver" << !
    cd electrum-downloads-airlock
-   -mkdir "$version"
-   -chmod 777 "$version"
-   cd "$version"
-   mput *
+   -mkdir "$VERSION"
+   -chmod 777 "$VERSION"
+   cd "$VERSION"
+   -mput *
+   -chmod 444 *  # this prevents future re-uploads of same file
    bye
 !
+
+"$CONTRIB/trigger_deploy.sh" "$SSHUSER" "$VERSION"