Fix env config

[goccy]

always add the envconfig tag with UPPER_SNAKE_CASE

[github-actions]

Code Metrics Report

	main (669ac1f)	#255 (03e7dab)	+/-
Coverage	65.6%	65.6%	+0.0%
Code to Test Ratio	1:0.4	1:0.4	-0.0
Test Execution Time	8m10s	7m54s	-16s

Details

  |                     | main (669ac1f) | #255 (03e7dab) |  +/-  |
  |---------------------|----------------|----------------|-------|
+ | Coverage            |          65.6% |          65.6% | +0.0% |
  |   Files             |             76 |             76 |     0 |
  |   Lines             |          12784 |          12785 |    +1 |
+ |   Covered           |           8384 |           8385 |    +1 |
- | Code to Test Ratio  |          1:0.4 |          1:0.4 |  -0.0 |
  |   Code              |          39661 |          39662 |    +1 |
  |   Test              |          15435 |          15435 |     0 |
+ | Test Execution Time |          8m10s |          7m54s |  -16s |

Code coverage of files in pull request scope (77.4% → 77.4%)

Files	Coverage	+/-
generator/code_generator.go	77.4%	+0.0%

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Reported by octocov