Add github to known hosts to avoid the unknown host error

[chrzaszcz]

The issue is present when the latest docs are deployed from 'master', because there is no 'checkout' step now (the workspace is restored instead), and push access is needed in git.

I tested it manually on CircleCI with SSH.

[mongoose-im]

small_tests_24 / small_tests / f95fc63
Reports root / small

---

small_tests_25 / small_tests / f95fc63
Reports root / small

---

small_tests_25_arm64 / small_tests / f95fc63
Reports root / small

---

dynamic_domains_pgsql_mnesia_24 / pgsql_mnesia / f95fc63
Reports root/ big
OK: 4194 / Failed: 0 / User-skipped: 88 / Auto-skipped: 0

---

ldap_mnesia_24 / ldap_mnesia / f95fc63
Reports root/ big
OK: 2222 / Failed: 0 / User-skipped: 834 / Auto-skipped: 0

---

dynamic_domains_mysql_redis_25 / mysql_redis / f95fc63
Reports root/ big
OK: 4168 / Failed: 0 / User-skipped: 114 / Auto-skipped: 0

---

dynamic_domains_mssql_mnesia_25 / odbc_mssql_mnesia / f95fc63
Reports root/ big
OK: 4191 / Failed: 0 / User-skipped: 91 / Auto-skipped: 0

---

ldap_mnesia_25 / ldap_mnesia / f95fc63
Reports root/ big
OK: 2222 / Failed: 0 / User-skipped: 834 / Auto-skipped: 0

---

pgsql_mnesia_24 / pgsql_mnesia / f95fc63
Reports root/ big
OK: 4567 / Failed: 0 / User-skipped: 97 / Auto-skipped: 0

---

internal_mnesia_25 / internal_mnesia / f95fc63
Reports root/ big
OK: 2368 / Failed: 0 / User-skipped: 688 / Auto-skipped: 0

---

pgsql_mnesia_25 / pgsql_mnesia / f95fc63
Reports root/ big
OK: 4567 / Failed: 0 / User-skipped: 97 / Auto-skipped: 0

---

elasticsearch_and_cassandra_25 / elasticsearch_and_cassandra_mnesia / f95fc63
Reports root/ big
OK: 2728 / Failed: 0 / User-skipped: 667 / Auto-skipped: 0

---

mysql_redis_25 / mysql_redis / f95fc63
Reports root/ big
OK: 4553 / Failed: 0 / User-skipped: 111 / Auto-skipped: 0

---

mssql_mnesia_25 / odbc_mssql_mnesia / f95fc63
Reports root/ big
OK: 4564 / Failed: 0 / User-skipped: 100 / Auto-skipped: 0

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (7c0303d) 82.19% compared to head (f95fc63) 82.19%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4023   +/-   ##
=======================================
  Coverage   82.19%   82.19%           
=======================================
  Files         535      535           
  Lines       33841    33841           
=======================================
+ Hits        27815    27817    +2     
+ Misses       6026     6024    -2     

see 2 files with indirect coverage changes

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