contrib: rename some shell scripts to have ".sh" extension

The extension gives formatting hints to some editors. (especially if they support .editorconfig)

contrib/upload.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+# uploadserver is set in /etc/hosts
+#
+# env vars:
+# - ELECBUILD_UPLOADFROM
+# - SSHUSER
+
+set -e
+
+PROJECT_ROOT="$(dirname "$(readlink -e "$0")")/.."
+
+if [ -z "$SSHUSER" ]; then
+    SSHUSER=thomasv
+fi
+
+cd "$PROJECT_ROOT"
+
+version=`git describe --tags --abbrev=0`
+echo $version
+
+if [ -z "$ELECBUILD_UPLOADFROM" ]; then
+    cd "$PROJECT_ROOT/dist"
+else
+    cd "$ELECBUILD_UPLOADFROM"
+fi
+
+
+# do not fail sftp if directory exists
+# see https://stackoverflow.com/questions/51437924/bash-shell-sftp-check-if-directory-exists-before-creating
+
+sftp -oBatchMode=no -b - "$SSHUSER@uploadserver" << !
+   cd electrum-downloads-airlock
+   -mkdir "$version"
+   -chmod 777 "$version"
+   cd "$version"
+   mput *
+   bye
+!