Deploy memcached on deposit instance

So the authentication token cached during its validity period can be shared amongst threads.

Related to T3166

Test Plan

octocatalog-diff

$ bin/octocatalog-diff --octocatalog-diff-args --no-truncate-details --to staging moma
Found host moma.softwareheritage.org
*** Running octocatalog-diff on host moma.softwareheritage.org
I, [2021-03-24T09:49:51.822272 #18198]  INFO -- : Catalogs compiled for moma.softwareheritage.org
I, [2021-03-24T09:49:54.646341 #18198]  INFO -- : Diffs computed for moma.softwareheritage.org
I, [2021-03-24T09:49:54.646405 #18198]  INFO -- : No differences
*** End octocatalog-diff on moma.softwareheritage.org
$ bin/octocatalog-diff --octocatalog-diff-args --no-truncate-details --to staging deposit.internal.staging.swh.network
Found host deposit.internal.staging.swh.network
*** Running octocatalog-diff on host deposit.internal.staging.swh.network
I, [2021-03-24T09:49:04.449118 #11450]  INFO -- : Catalogs compiled for deposit.internal.staging.swh.network
I, [2021-03-24T09:49:06.580434 #11450]  INFO -- : Diffs computed for deposit.internal.staging.swh.network
diff origin/production/deposit.internal.staging.swh.network current/deposit.internal.staging.swh.network
*******************************************
+ File[/etc/memcached.conf] =>
   parameters =>
      "group": 0
      "mode": "0644"
      "notify": "Service[memcached]"
      "owner": "root"
      "content": >>>
# File managed by puppet

# Run memcached as a daemon.
-d

# pidfile
-P /var/run/memcached.pid

# Log memcached's output
logfile /var/log/memcached.log

# Use <num> MB memory max to use for object storage.
-m 398




# IP to listen on
-l 127.0.0.1

# TCP port to listen on
-p 11211

# UDP port to listen on
-U 11211

# Run daemon as user
-u nobody


# Limit the number of simultaneous incoming connections.
-c 8192

# Number of threads to use to process incoming requests.
-t 4
<<<
*******************************************
  File[/etc/softwareheritage/deposit/server.yml] =>
   parameters =>
     content =>
      @@ -28,4 +28,5 @@
         server_url: https://auth.softwareheritage.org/auth/
         realm_name: SoftwareHeritageStaging
      +cache_uri: 127.0.0.1:11211
       allowed_hosts:
       - deposit.staging.swh.network
*******************************************
+ Package[memcached] =>
   parameters =>
      "ensure": "present"
*******************************************
+ Service[memcached] =>
   parameters =>
      "enable": true
      "ensure": "running"
      "hasrestart": true
      "hasstatus": false
*******************************************
*** End octocatalog-diff on deposit.internal.staging.swh.network

vagrant checks (provisioning step fine and services started without complaints):

• deposit.staging: ok
• prod-moma: ok

---

Migrated from D5317 (view on Phabricator)