Fix race condition

[k1LoW]

ref: #1091

I have added a global mutex in this PR and would like to remove it in the future.

[github-actions]

BenchmarkManyRunbooks-4

	main (-)	#1092 (cbdb8b4)	+/-
Number of iterations	1	1	0
Nanoseconds per iteration	3,672,809,057 ns/op	3,437,094,600 ns/op	-235,714,457 ns/op
Bytes allocated per iteration	1,318,815,096 B/op	1,318,865,568 B/op	50,472 B/op
Allocs per iteration	18,781,636 allocs/op	18,782,318 allocs/op	682 allocs/op

Metadata

	main (-)	#1092 (cbdb8b4)
goos	linux	linux
goarch	amd64	amd64
pkg	github.com/k1LoW/runn	github.com/k1LoW/runn
cpu	AMD EPYC 7763 64-Core Processor	AMD EPYC 7763 64-Core Processor

BenchmarkOpenAPI3-4

	main (-)	#1092 (cbdb8b4)	+/-
Number of iterations	1	1	0
Nanoseconds per iteration	4,652,323,024 ns/op	4,746,533,410 ns/op	94,210,386 ns/op
Bytes allocated per iteration	2,278,396,112 B/op	2,278,228,856 B/op	-167,256 B/op
Allocs per iteration	31,456,338 allocs/op	31,457,028 allocs/op	690 allocs/op

Metadata

	main (-)	#1092 (cbdb8b4)
goos	linux	linux
goarch	amd64	amd64
pkg	github.com/k1LoW/runn	github.com/k1LoW/runn
cpu	AMD EPYC 7763 64-Core Processor	AMD EPYC 7763 64-Core Processor

BenchmarkSingleRunbook-4

	main (-)	#1092 (cbdb8b4)	+/-
Number of iterations	25	26	1
Nanoseconds per iteration	44,877,953 ns/op	44,646,967 ns/op	-230,986 ns/op
Bytes allocated per iteration	20,820,115 B/op	20,802,979 B/op	-17,136 B/op
Allocs per iteration	181,085 allocs/op	181,074 allocs/op	-11 allocs/op

Metadata

	main (-)	#1092 (cbdb8b4)
goos	linux	linux
goarch	amd64	amd64
pkg	github.com/k1LoW/runn	github.com/k1LoW/runn
cpu	AMD EPYC 7763 64-Core Processor	AMD EPYC 7763 64-Core Processor

---

Reported by octocov

[github-actions]

Code Metrics Report

	main (bac268e)	#1092 (cbdb8b4)	+/-
Coverage	64.5%	64.5%	-0.1%
Code to Test Ratio	1:0.7	1:0.7	-0.1
Test Execution Time	6m32s	4m38s	-1m54s

Details

  |                     | main (bac268e) | #1092 (cbdb8b4) |  +/-   |
  |---------------------|----------------|-----------------|--------|
- | Coverage            |          64.5% |           64.5% |  -0.1% |
  |   Files             |             77 |              77 |      0 |
  |   Lines             |           8836 |            8843 |     +7 |
+ |   Covered           |           5703 |            5707 |     +4 |
- | Code to Test Ratio  |          1:0.7 |           1:0.7 |   -0.1 |
  |   Code              |          16200 |           16212 |    +12 |
  |   Test              |          12251 |           12251 |      0 |
+ | Test Execution Time |          6m32s |           4m38s | -1m54s |

Code coverage of files in pull request scope (71.8% → 71.7%)

Files	Coverage	+/-
dbg.go	4.5%	+1.6%
eval.go	82.6%	-0.5%
http_validator.go	81.1%	-1.1%
operator.go	80.0%	0.0%

---

Reported by octocov