feat: fix dockerfile missing package (tzdata)

[pawelmarkowski]

Alpine Linux (used in the Dockerfile) doesn't include timezone data by default, which causes the error:

 the request url is  /api/add-rule
2026/02/16 00:54:06.483 [C] [panic.go:884]  Handler crashed with error unknown time zone Asia/Singapore
2026/02/16 00:54:06.483 [C] [panic.go:884]  /usr/local/go/src/runtime/panic.go:884
2026/02/16 00:54:06.483 [C] [panic.go:884]  /go/src/caswaf/util/time.go:22
2026/02/16 00:54:06.483 [C] [panic.go:884]  /go/src/caswaf/controllers/rule.go:91
2026/02/16 00:54:06.483 [C] [panic.go:884]  /usr/local/go/src/reflect/value.go:586
2026/02/16 00:54:06.483 [C] [panic.go:884]  /usr/local/go/src/reflect/value.go:370
2026/02/16 00:54:06.483 [C] [panic.go:884]  /go/pkg/mod/github.com/beego/beego@v1.12.12/router.go:897
2026/02/16 00:54:06.483 [C] [panic.go:884]  /usr/local/go/src/net/http/server.go:2936
2026/02/16 00:54:06.483 [C] [panic.go:884]  /usr/local/go/src/net/http/server.go:1995
2026/02/16 00:54:06.483 [C] [panic.go:884]  /usr/local/go/src/runtime/asm_amd64.s:1598

To fix that, we have to add the tzdata package installer to the Dockerfile.

[Copilot]

Pull request overview

This PR fixes a runtime panic in the Docker container by adding the missing tzdata package to the Alpine Linux base image. The application uses time.LoadLocation("Asia/Singapore") in the util.GetCurrentTime() function, which requires timezone data that Alpine doesn't include by default.

Changes:

• Added tzdata package to the Alpine package installation in the Dockerfile

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[github-actions]

🎉 This PR is included in version 1.72.0 🎉

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