Add initial PostgreSQL and pgAdmin services with Nomad configuration

2-nomad-config/postgres.nomad.hcl

@@ -0,0 +1,64 @@
+job "postgres" {
+  group "postgres" {
+    service {
+      name = "postgres"
+      port = "db"
+      
+      connect {
+        sidecar_service {}
+      }
+    }
+
+    task "postgres" {
+      driver = "docker"
+
+      config {
+        image = "postgres:latest"
+        ports = ["db"]
+
+        volumes = [
+          "secrets/postgres_password:/run/secrets/postgres_password"
+        ]
+      }
+
+      volume_mount {
+        volume      = "data"
+        destination = "/var/lib/postgresql/data"
+        read_only   = false
+      }
+
+      env {
+        POSTGRES_USER = "postgres"
+        POSTGRES_PASSWORD_FILE = "/run/secrets/postgres_password"
+        POSTGRES_INITDB_ARGS = "--auth-host=md5"
+      }
+
+      resources {
+        cpu    = 500
+        memory = 512
+      }
+
+      template {
+        # This securely sets the initial password for the postgres user, to change it later
+        # you need to connect to the database and change it manually
+        data = <<EOF
+{{ with nomadVar "nomad/jobs/postgres" }}{{ .postgress_password }}{{ end }}
+EOF
+        destination = "secrets/postgres_password"
+      }
+    }
+
+    network {
+      mode = "bridge"
+      port "db" {
+        static = 5432
+      }
+    }
+
+    volume "data" {
+      type      = "host"
+      read_only = false
+      source    = "postgres"
+    }
+  }
+}