Add contributors-bot workflow

[AUdaltsova]

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Benchmark Results

Benchmark results

?   	github.com/openclimatefix/data-platform/cmd	[no test files]
?   	github.com/openclimatefix/data-platform/internal/gen/ocf/dp	[no test files]
?   	github.com/openclimatefix/data-platform/internal/interceptors	[no test files]
PASS
ok  	github.com/openclimatefix/data-platform/internal/server/dummy	0.005s
{"level":"debug","time":"2026-04-02T14:36:45Z","message":"Completed migrations"}
goos: linux
goarch: amd64
pkg: github.com/openclimatefix/data-platform/internal/server/postgres
cpu: AMD EPYC 9V74 80-Core Processor                
BenchmarkPostgresClient/small/GetForecastAsTimeseries-4         	      67	  16730074 ns/op
BenchmarkPostgresClient/small/GetForecastAtTimestamp-4          	     268	   4079648 ns/op
BenchmarkPostgresClient/small/GetObservationsAsTimeseries-4     	     932	   1188323 ns/op
BenchmarkPostgresClient/small/CreateForecast-4                  	      99	  11583052 ns/op
PASS
ok  	github.com/openclimatefix/data-platform/internal/server/postgres	63.311s
?   	github.com/openclimatefix/data-platform/internal/server/postgres/gen	[no test files]

Benchmark vs base branch

goos: linux
goarch: amd64
pkg: github.com/openclimatefix/data-platform/internal/server/postgres
cpu: AMD EPYC 7763 64-Core Processor                
                                                   │ bench-main.txt │
                                                   │     sec/op     │
PostgresClient/small/GetForecastAsTimeseries-4         17.24m ± ∞ ¹
PostgresClient/small/GetForecastAtTimestamp-4          4.008m ± ∞ ¹
PostgresClient/small/GetObservationsAsTimeseries-4     1.199m ± ∞ ¹
PostgresClient/small/CreateForecast-4                  12.96m ± ∞ ¹
geomean                                                5.724m
¹ need >= 6 samples for confidence interval at level 0.95

cpu: AMD EPYC 9V74 80-Core Processor                
                                                   │ bench-AUdaltsova-patch-1.txt │
                                                   │            sec/op            │
PostgresClient/small/GetForecastAsTimeseries-4                       16.73m ± ∞ ¹
PostgresClient/small/GetForecastAtTimestamp-4                        4.080m ± ∞ ¹
PostgresClient/small/GetObservationsAsTimeseries-4                   1.188m ± ∞ ¹
PostgresClient/small/CreateForecast-4                                11.58m ± ∞ ¹
geomean                                                              5.536m
¹ need >= 6 samples for confidence interval at level 0.95