Backend helm chart running on Kubernetes

## Do some fancy replacements
```bash
sed -E \
-e 's/^(description:).*/\1 Raspberry Pi Backend helm chart/' \
-e 's/^(appVersion:).*/\1 0.0.1 /' \
-e '$a  \\ndependencies: \n- name: postgresql \n  version: "9.8.3" \n  repository: "https://charts.bitnami.com/bitnami" \n' \
-i backend/Chart.yaml

Add helm chart registry

helm repo list
helm repo add bitnami https://charts.bitnami.com/bitnami
helm dependency update backend

sed -E \
-e 's/^(.*paths:).*/\1 ["\/api"]/' \
-e '/^ingress.*/,/^\s*tls:.*/s/^(.*-\shost: )(.*)/\1 raspberrypi--weather-monitoring/' \
-e '/^.*pullPolicy:.*/a \ \ containerPort: 8000' \
-e '/^.*pullPolicy:.*/a \ \ # Database connection settings:' \
-e '/^.*pullPolicy:.*/a \ \ env:' \
-e '/^.*pullPolicy:.*/a \ \ \ \ secret:' \
-e '/^.*pullPolicy:.*/a \ \ \ \ \ \ PSQL_DB_USER: "micro"' \
-e '/^.*pullPolicy:.*/a \ \ \ \ \ \ PSQL_DB_PASS: "password"' \
-e '/^.*pullPolicy:.*/a \ \ \ \ \ \ PSQL_DB_NAME: "microservice"' \
-e '/^.*pullPolicy:.*/a \ \ \ \ \ \ PSQL_DB_ADDRESS: "backend-postgresql"' \
-e '/^.*pullPolicy:.*/a \ \ \ \ \ \ PSQL_DB_PORT: "5432"' \
-e '$a \\nlivenessProbe: \/api\/health' \
-e '$a \\nreadinessProbe: \/api\/health' \
-e 's/^(.*repository:).*/\1 jantoth\/weather-backend/' \
-i backend/values.yaml

Create backend values.yaml file

cat <<'EOF' >>backend/values.yaml

postgresql:
  image:
    registry: docker.io
    repository: bitnami/postgresql
    tag: latest
    debug: true

  global:
    postgresql:
      postgresqlUsername: postgres
      postgresqlPassword: password

  persistence:
    enabled: false

  pgHbaConfiguration: |
    local all all trust
    host all all localhost trust
    host microservice micro 10.42.0.0/16 password

  initdbScripts:
    db-init.sql: |
      CREATE DATABASE microservice;
      CREATE USER micro WITH ENCRYPTED PASSWORD 'password';
      GRANT ALL PRIVILEGES ON DATABASE microservice TO micro;
      ALTER DATABASE microservice OWNER TO micro;

EOF

Set targetPort

sed -E \
-e 's/^(.*targetPort:).*/\1 {{ .Values.image.containerPort | default 80 }}/' \
-i backend/templates/service.yaml

Setup “livenessProbe” and “readinessProbe” in backend/templates/deployment.yaml

sed -E \
-e '/^\s*livenessProbe:.*/,/^\s*port:.*/s/^(.*port:)(.*)/\1 {{ .Values.image.containerPort | default "http" }}/' \
-e '/^\s*readinessProbe:.*/,/^\s*port:.*/s/^(.*port:)(.*)/\1 {{ .Values.image.containerPort | default "http" }}/' \
-e '/^\s*livenessProbe:.*/,/^\s*port:.*/s/^(.*path:)(.*)/\1 {{ .Values.livenessProbe | default "\/" }}/' \
-e '/^\s*readinessProbe:.*/,/^\s*port:.*/s/^(.*path:)(.*)/\1 {{ .Values.readinessProbe | default "\/" }}/' \
-e 's/^(.*containerPort:).*/\1 {{ .Values.image.containerPort }}/' \
-e '/^.*image:.*/a \ \ \ \ \ \ \ \ \ \ env:' \
-e '/^.*image:.*/a \ \ \ \ \ \ \ \ \ \ {{- include "helpers.list-env-variables" . | indent 10 }}' \
-i backend/templates/deployment.yaml

Creating file: “backend/templates/secret.yaml”

cat <<'EOF' >>backend/templates/secret.yaml

apiVersion: v1
kind: Secret
metadata:
  name: database-conection
type: Opaque
data:
  {{- range $key, $val := .Values.image.env.secret }}
  {{ $key }}: {{ $val | b64enc }}
  {{- end}}

EOF

Helper tpl

cat <<'EOF' >>backend/templates/_helpers.tpl

{{/*
Create the looper to define secret mounts as ENV variables
*/}}

{{- define "helpers.list-env-variables"}}
{{- range $key, $val := .Values.image.env.secret }}
- name: {{ $key }}
  valueFrom:
    secretKeyRef:
      name: database-conection
      key: {{ $key }}
{{- end}}
{{- end}}
EOF