Add kustomize deployment configs for service

apiVersion: cert-manager.io/v1

kind: Certificate

metadata:

  name: smtp.kodo.org.uk

spec:

  commonName: smtp.kodo.org.uk

  dnsNames:

  - smtp.kodo.org.uk

  issuerRef:

    kind: ClusterIssuer

    name: letsencrypt

  secretName: smtp.kodo.org.uk

apiVersion: apps/v1

kind: Deployment

metadata:

  name: postfix

  annotations:

    reloader.stakater.com/auto: "true"

spec:

  template:

    spec:

      volumes:

      - name: config

        emptyDir: {}

      - name: base-config

        configMap:

          name: postfix

      - name: tls

        secret:

          secretName: smtp.kodo.org.uk

      - name: mysql

        secret:

          secretName: maildb.kodo.org.uk

      containers:

      - name: postfix

        volumeMounts:

        - name: config

          mountPath: /etc/postfix

        - name: tls

          mountPath: /etc/tls

      initContainers:

      - name: init-mysql

        image: busybox:latest

        volumeMounts:

        - name: config

          mountPath: /etc/postfix

        - name: base-config

          mountPath: /source

        - name: mysql

          mountPath: /secrets

        command:

        - sh

        - -c

        - |

          . /secrets/pass.cnf

          cp -Lr /source/* /etc/postfix/

          tee -a /etc/postfix/mysql_*.cf <<END_CONF >/dev/null

          hosts = dex.kodo.org.uk

          user = $username

          password = $password

          END_CONF

apiVersion: kustomize.config.k8s.io/v1beta1

kind: Kustomization

resources:

- https://code.kodo.org.uk/docker/postfix//kustomize/?ref=main

- certificate.yaml

patches:

- path: deployment.patch.yaml

configMapGenerator:

- name: postfix

  files:

  - conf/bounce.cf

  - conf/main.cf

  - conf/mysql_alias.cf

  - conf/mysql_domains.cf