run tests on each distribution in parallel (#56219)

see also upstream: https://github.com/psycopg/psycopg2/issues/1293

Jenkinsfile

@@ -4,24 +4,31 @@ pipeline {
     agent any
     options { disableConcurrentBuilds() }
     stages {
-        stage('Unit Tests (buster)') {
-            steps {
-                catchError(stageResult: 'FAILURE') {
-                    sh 'sudo ./test-nspawn buster'
+        stage('Unit Tests') {
+            parallel {
+                stage('Unit Tests (buster)') {
+                    agent any
+                    steps {
+                        catchError(stageResult: 'FAILURE') {
+                            sh 'sudo ./test-nspawn buster'
+                        }
+                    }
                 }
-            }
-        }
-        stage('Unit Tests (bullseye)') {
-            steps {
-                catchError(stageResult: 'FAILURE') {
-                    sh 'sudo ./test-nspawn bullseye'
+                stage('Unit Tests (bullseye)') {
+                    agent any
+                    steps {
+                        catchError(stageResult: 'FAILURE') {
+                            sh 'sudo ./test-nspawn bullseye'
+                        }
+                    }
                 }
-            }
-        }
-        stage('Unit Tests (bookworm)') {
-            steps {
-                catchError(stageResult: 'FAILURE') {
-                    sh 'sudo ./test-nspawn bookworm'
+                stage('Unit Tests (bookworm)') {
+                    agent any
+                    steps {
+                        catchError(stageResult: 'FAILURE') {
+                            sh 'sudo ./test-nspawn bookworm'
+                        }
+                    }
                 }
             }
         }

roles/base/tasks/main.yml

@@ -74,6 +74,7 @@
 - name: install psycopg2-binary
   pip:
     name: psycopg2-binary
+    version: 2.8.6
     virtualenv: "{{venv_py3}}"
 
 - name: install pytest