Bump to jenkins-library 2.8.1 and apply related modifications + Use IPFS public DNS name

Author: Marc

Jenkinsfile_Subgraph_bellecour_stagingv8

@@ -0,0 +1,11 @@
+//Readme @ http://gitlab.iex.ec:30000/iexec/jenkins-library
+
+@Library('[email protected]') _
+deploySubGraph(
+  targetRemoteHostGraphNode : 'azubgrpbx-thegraph-staging.public.az2.internal',
+  targetRemoteHostIPFS : 'ipfs-upload.stagingv8.iex.ec',
+  subgraphFolder: './',
+  subgraphFilename: 'subgraph.bellecour.yaml',
+  subgraphVersionLabel: 'v1.0.0-rc.1',
+  subgraphLabel: 'bellecour/poco-v5'
+)