iteration 124987: no this time is the one, you guys

Jenkinsfile

@@ -21,20 +21,20 @@ pipeline {
                           -H 'accept: application/json' \
                           -H 'Authorization: token ${env.JENKINSONGITEA}' \
                           -H 'Content-Type: application/json' \
-                          --data-binary post.json
+                          --data-binary @post.json
 
                         rm post.json
                     """)
 
                     //to matrix
                     env.avatarMXC=sh(returnStdout: true, script:  """
-                        curl 'https://greyn.club:8448/_matrix/media/v3/upload?filename=potterverse-wizards-are-morons-avatar.png' \
+                        curl 'https://greyn.club:8448/_matrix/media/v3/upload?filename=potterverse-wizards-are-morons-avatar-\$(mktemp -u XXX).png' \
                           -X 'POST' \
                           -H 'authorization: Bearer ${env.JENKINSONMATRIXTOKEN}' \
                           -H 'Content-Type: image/png' \
                           --compressed \
                           --data-binary @meta/avatar.png \
-                          | jq .content_uri
+                          | jq -r .content_uri
                         """).trim()
 
                     sh(returnStdout: true, script:  """