MT#55813 MT#55391 Use bundled yarn

yarnpkg is no longer available in Debian/bookworm, while we already
Build-Depend on nodejs >= 18 (also for Debian/bullseye), so instead lets
ship a bundled yarnpkg, like we do also in e.g. ngcp-rest-api.

Related to git commit 4b03168df1

Change-Id: I5098f2f188a36eb72e0f01b49da7472f2c53b83f

debian/control

@@ -8,7 +8,6 @@ Build-Depends:
  debhelper-compat (= 13),
  nodejs (>= 18),
  python3,
- yarnpkg,
 
 Package: ngcp-csc-ui
 Architecture: all

debian/missing-sources/yarn-1.22.19.js

@@ -0,0 +1,8 @@
+/*
+The file .yarn/releases/yarn-1.22.19.js is a copy of
+https://github.com/yarnpkg/yarn/releases/download/v1.22.19/yarn-1.22.19.js
+
+Its source code is available at
+https://github.com/yarnpkg/yarn/archive/refs/tags/v1.22.19.tar.gz
+(and a copy of this is available at https://deb.sipwise.com/files/yarn_v1.22.19.tar.gz )
+*/

debian/rules

@@ -8,8 +8,7 @@ export NODE_PATH=/usr/lib/nodejs:/usr/share/nodejs
 # webpack 4.x compatibility, remove it when @quasar/app is upgraded and it uses webpack 5.x
 export NODE_OPTIONS=--openssl-legacy-provider
 
-# if yarnpkg is available use it, otherwise fall back to yarn
-YARN_BIN := $(shell which yarnpkg || echo yarn)
+YARN_BIN := ".yarn/releases/yarn-1.22.19.js"
 
 %:
 	dh "$@"