release: fix sed to update the manifests

[cpanato]

Summary

• while doing some tests notice the sed is kind of broken and also update the var to use the git tag, which I guess was the initial idea

update the sed to make it work

the error

Step #3: sed -i -e 's;gcr.io/projectsigstore/fulcio:.*;gcr.io/projectsigstore/fulcio:2f2561a0c752aa4c4cafe14dcdb95b4911b01ff8/g' fulcio-v0.2.0.yaml
Step #3: sed: -e expression #1, char 107: unterminated `s' command

after the change and using my docker registry as a name

....
        - name: fulcio-server
          image: ctadeu/fulcio:v0.2.0-1-g2bc6c5a-dirty
          ports:
....

Ticket Link

n/a

Release Note

NONE

[codecov-commenter]

Codecov Report

Merging #466 (26c1cd4) into main (2f2561a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #466   +/-   ##
=======================================
  Coverage   45.66%   45.66%           
=======================================
  Files          14       14           
  Lines         957      957           
=======================================
  Hits          437      437           
  Misses        460      460           
  Partials       60       60           

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