Add Leo banner, update release.yml, update workflows

[howardwu]

Motivation

Add Leo banner, update release.yml, update workflows

[codecov]

Codecov Report

Merging #506 (defe596) into master (4c4338e) will decrease coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #506      +/-   ##
==========================================
- Coverage   74.17%   73.99%   -0.19%     
==========================================
  Files         470      470              
  Lines       13786    13786              
==========================================
- Hits        10226    10201      -25     
- Misses       3560     3585      +25     

Impacted Files	Coverage Δ
compiler/src/expression/arithmetic/mul.rs	0.00% <0.00%> (-23.81%)	⬇️
compiler/tests/integers/uint_macro.rs	96.70% <0.00%> (-3.30%)	⬇️
ast/src/expression/binary.rs	83.33% <0.00%> (-2.78%)	⬇️
compiler/src/value/integer/integer.rs	94.57% <0.00%> (-2.72%)	⬇️
grammar/src/ast.rs	94.38% <0.00%> (-1.13%)	⬇️
compiler/src/expression/expression.rs	95.83% <0.00%> (-0.84%)	⬇️
ast/src/expression/mod.rs	85.71% <0.00%> (-0.45%)	⬇️

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