cassandra_install: Add static key

[rhysmeister]

SUMMARY

Prevent occassionaly problems with downloading the key by importing it from a static file. Probably ip-based rate limiting causes this.

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

cassandra_install

• Branch was erroneously named!

[codecov[bot]]

Codecov Report

Merging #258 (95f2433) into master (95be69a) will decrease coverage by 6.05%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #258      +/-   ##
==========================================
- Coverage   77.72%   71.67%   -6.05%     
==========================================
  Files          36       30       -6     
  Lines        2510     2221     -289     
  Branches      564      525      -39     
==========================================
- Hits         1951     1592     -359     
- Misses        295      370      +75     
+ Partials      264      259       -5     

see 13 files with indirect coverage changes