Add Postgres readiness checks before psql execs

Prevents race conditions where pod is found but Postgres isn't ready yet.

Author: sfc-gh-jmckulka

testing/chainsaw/e2e/pgbackrest-restore/templates/create-cluster.yaml

@@ -81,6 +81,12 @@ spec:
                 postgres-operator.crunchydata.com/role=master'
           )
 
+          # Wait for PostgreSQL to be ready
+          until kubectl exec --namespace "${NAMESPACE}" "${PRIMARY}" \
+            -- psql -qAt --command 'SELECT 1' 2>/dev/null; do
+            sleep 1
+          done
+
           kubectl exec --stdin --namespace "${NAMESPACE}" "${PRIMARY}" -- psql -q --file=- <<'SQL'
             CREATE TABLESPACE barn LOCATION '/tablespaces/barn/data';
             GRANT ALL ON TABLESPACE barn TO public;

testing/chainsaw/e2e/pgbackrest-restore/templates/lose-data.yaml

@@ -31,6 +31,12 @@ spec:
           - name: PRIMARY
             value: ($primary)
         content: |
+          # Wait for PostgreSQL to be ready
+          until kubectl exec --namespace "${NAMESPACE}" "${PRIMARY}" \
+            -- psql -qAt --command 'SELECT 1' 2>/dev/null; do
+            sleep 1
+          done
+
           OBJECTIVE=$(
             kubectl exec --namespace "${NAMESPACE}" "${PRIMARY}" \
               -- psql -qAt --command 'SELECT clock_timestamp()'

testing/chainsaw/e2e/pgbackrest-restore/templates/verify-backup.yaml

@@ -17,6 +17,12 @@ spec:
                 postgres-operator.crunchydata.com/role=master'
           )
 
+          # Wait for PostgreSQL to be ready
+          until kubectl exec --namespace "${NAMESPACE}" "${PRIMARY}" \
+            -- psql -qAt --command 'SELECT 1' 2>/dev/null; do
+            sleep 1
+          done
+
           kubectl exec --namespace "${NAMESPACE}" "${PRIMARY}" \
             -- psql --command 'SELECT pg_switch_wal()' --pset footer=off