gosop chokes on filenames shorter than 5 characters

[teythoon]

$ gosop sign foo6 <<< huhu
panic: runtime error: slice bounds out of range [:5] with length 4

goroutine 1 [running]:
github.com/ProtonMail/gosop/utils.ReadFileOrEnv({0x7fff8c1c416f?, 0x0?})
	/home/teythoon/repos/pep/openpgp-interoperability-test-suite/sops/v6/gosop/utils/utils.go:165 +0x105
github.com/ProtonMail/gosop/utils.CollectKeysPassword({0x0, 0x0, 0x0}, {0xc000119600, 0x1, 0x8?})
	/home/teythoon/repos/pep/openpgp-interoperability-test-suite/sops/v6/gosop/utils/utils.go:140 +0x8d
github.com/ProtonMail/gosop/cmd.Sign({0xc000119600, 0x1, 0x1})
	/home/teythoon/repos/pep/openpgp-interoperability-test-suite/sops/v6/gosop/cmd/sign.go:31 +0x158
github.com/ProtonMail/gosop/cmd.glob..func5(0xc00012a240?)
	/home/teythoon/repos/pep/openpgp-interoperability-test-suite/sops/v6/gosop/cmd/commands.go:65 +0x51
github.com/urfave/cli/v2.(*Command).Run(0x987b40, 0xc0001627c0)
	/home/teythoon/go/pkg/mod/github.com/urfave/cli/[email protected]/command.go:164 +0x5dc
github.com/urfave/cli/v2.(*App).RunContext(0xc0001b6000, {0x7b5430?, 0xc000152358}, {0xc00011a150, 0x3, 0x3})
	/home/teythoon/go/pkg/mod/github.com/urfave/cli/[email protected]/app.go:306 +0xbfd
github.com/urfave/cli/v2.(*App).Run(...)
	/home/teythoon/go/pkg/mod/github.com/urfave/cli/[email protected]/app.go:215
main.main()
	/home/teythoon/repos/pep/openpgp-interoperability-test-suite/sops/v6/gosop/main.go:37 +0x205

[lubux]

Thanks for the report. Fixed on the gosop-gopenpgp-v3 branch with commit 1359d0ac