add exec.json

Signed-off-by: Nathanael DEMACON <quantumsheep@users.noreply.github.com>

Author: quantumsheep

internal/endtoend/testdata/expose_db_connection/exec.json

@@ -0,0 +1,3 @@
+{
+  "contexts": ["managed-db"]
+}

internal/endtoend/testdata/expose_db_connection/sqlc.json

@@ -0,0 +1,9 @@
+version: "2"
+sql:
+  - engine: "postgresql"
+    schema: "schema.sql"
+    queries: "query.sql"
+    gen:
+      go:
+        out: "db"
+        expose_db_connection: true