Fix buildspec script

Install postgresql

ooniapi/services/oonirun/buildspec.yml

@@ -3,21 +3,30 @@ env:
   variables:
     OONI_CODE_PATH: ooniapi/services/oonirun
     DOCKERHUB_SECRET_ID: oonidevops/dockerhub/access_token
+    LANG: "en_US.UTF-8"
+    LANGUAGE: "en_US.UTF-8"
+    LC_CTYPE: "en_US.UTF-8"
 
 phases:
   install:
     runtime-versions:
       python: 3.11
     commands:
       - pip install hatch
+      - echo "deb https://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list
+      - wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -
+      - apt-get update
+      - apt install -y postgresql-16
 
   pre_build:
+    run-as: codebuild-user
     commands:
       - aws --version
       - echo "Logging in to ECR"
       - aws secretsmanager get-secret-value --secret-id $DOCKERHUB_SECRET_ID --query SecretString --output text | docker login --username ooni --password-stdin
 
   build:
+    run-as: codebuild-user
     commands:
       - cd $OONI_CODE_PATH
       - export GIT_FULL_SHA=${CODEBUILD_RESOLVED_SOURCE_VERSION}