Add retry args to prevent one-off failures in the future

.gitlab-ci.yml

@@ -43,6 +43,7 @@ Lint:
 
 Test:
   stage: test
+  retry: 1
   interruptible: yes
   except:
     - pipelines
@@ -53,6 +54,7 @@ Test:
 
 Play_Against_Pis:
   stage: play
+  retry: 1
   script:
     - ansible-playbook -l manufacturers_raspi site.yml --vault-password-file /vaultpw || error="$?"
     - if [ "$error" -eq 4 ]; then echo "Some hosts were unreachable; masking error"; unset error; fi
@@ -65,6 +67,7 @@ Play_Against_Desktops:
     - if [ -n "$error" ]; then echo "Return code $error"; false; fi
 Play_Against_Production:
   stage: play
+  retry: 1
   script:
     - ansible-playbook -l tags_prod site.yml --vault-password-file /vaultpw || error="$?"
     - if [ "$error" -eq 4 ]; then echo "Some hosts were unreachable; masking error"; unset error; fi