ci: improve release automation workflow

- Add a new GitHub Actions workflow for releases that triggers on any tag push, sets up Go environment, caches dependencies, and runs GoReleaser with Gitea token.
- Create a new GoReleaser configuration file that skips the build process, enables changelog generation with sorting, groups commits into categories for changelog, and excludes certain commit messages from the changelog.
- Define Gitea API and download URLs in the GoReleaser configuration.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

.goreleaser.yaml

@@ -0,0 +1,60 @@
+project_name: go
+
+builds:
+  - # If true, skip the build.
+    # Useful for library projects.
+    # Default is false
+    skip: true
+
+changelog:
+  # Set it to true if you wish to skip the changelog generation.
+  # This may result in an empty release notes on GitHub/GitLab/Gitea.
+  disable: false
+
+  # Changelog generation implementation to use.
+  #
+  # Valid options are:
+  # - `git`: uses `git log`;
+  # - `github`: uses the compare GitHub API, appending the author login to the changelog.
+  # - `gitlab`: uses the compare GitLab API, appending the author name and email to the changelog.
+  # - `github-native`: uses the GitHub release notes generation API, disables the groups feature.
+  #
+  # Defaults to `git`.
+  use: git
+
+  # Sorts the changelog by the commit's messages.
+  # Could either be asc, desc or empty
+  # Default is empty
+  sort: asc
+
+  # Group commits messages by given regex and title.
+  # Order value defines the order of the groups.
+  # Proving no regex means all commits will be grouped under the default group.
+  # Groups are disabled when using github-native, as it already groups things by itself.
+  #
+  # Default is no groups.
+  groups:
+    - title: Features
+      regexp: "^.*feat[(\\w)]*:+.*$"
+      order: 0
+    - title: "Bug fixes"
+      regexp: "^.*fix[(\\w)]*:+.*$"
+      order: 1
+    - title: "Enhancements"
+      regexp: "^.*chore[(\\w)]*:+.*$"
+      order: 2
+    - title: Others
+      order: 999
+
+  filters:
+    # Commit messages matching the regexp listed here will be removed from
+    # the changelog
+    # Default is empty
+    exclude:
+      - "^docs"
+      - "CICD"
+      - typo
+
+gitea_urls:
+  api: https://gitea.mediatek.inc/api/v1
+  download: https://gitea.mediatek.inc