shell: make sh and /bin/bash compatible on more OS(Ubuntu)

[allencloud]

Signed-off-by: Allen Sun [email protected]

Describe what this PR does / why we need it

sh init-registry.sh brings incompatibility on Ubuntu 20.04 LTS. We see that in init-registry.sh there is a shenbang #!/bin/bash. And when using sh to execute file, there will be some places displaying:

+ check_registry
+ n=1
init-registry.sh: 44: cannot open =: No such file
+ n 3
init-registry.sh: 44: n: not found

We update that with ./init-registry, and it would be the default shenbang #!/bin/bash to execute the shell file.

Does this pull request fix one issue?

fixes #1507

Describe how you did it

none

Describe how to verify it

none

Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #1508 (1b3de75) into main (bdedd8f) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main    #1508   +/-   ##
=======================================
  Coverage   10.59%   10.59%           
=======================================
  Files          84       84           
  Lines        7629     7629           
=======================================
  Hits          808      808           
  Misses       6719     6719           
  Partials      102      102           

Impacted Files	Coverage Δ
pkg/runtime/registry.go	0.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update bdedd8f...1b3de75. Read the comment docs.