chore: Added configuration files for generating the changelog of a release.

script/gcg/readme.md

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+# GCG - GitHub Changelog Generator
+
+Installation: https://github.com/ldez/gcg#how-to-install
+
+## Generates Changelog for a Bug Fix Release
+
+```bash
+gcg --config-file=./script/gcg/traefik-bugfix.toml
+```
+
+## Generates Changelog for a Final Release
+
+```bash
+gcg --config-file=./script/gcg/traefik-final-release-part1.toml
+```
+
+```bash
+gcg --config-file=./script/gcg/traefik-final-release-part2.toml
+```
+
+## Generates Changelog for the first RC of a Version
+
+```bash
+gcg --config-file=./script/gcg/traefik-rc-first.toml
+```
+
+## Generates Changelog for a RC of a Version
+
+```bash
+gcg --config-file=./script/gcg/traefik-rc-new.toml
+```

script/gcg/traefik-bugfix.toml

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+Owner = "traefik"
+RepositoryName = "traefik"
+
+OutputType = "file"
+FileName = "traefik_changelog.md"
+
+# example new bugfix v2.3.1
+CurrentRef = "v2.3"
+PreviousRef = "v2.3.0"
+BaseBranch = "v2.3"
+FutureCurrentRefName = "v2.3.1"
+
+ThresholdPreviousRef = 10
+ThresholdCurrentRef = 10
+
+Debug = true
+DisplayLabel = true
+
+LabelExcludes = ["area/infrastructure"]
+LabelEnhancement = "kind/enhancement"
+LabelDocumentation = "area/documentation"
+LabelBug = "kind/bug/fix"
+
+[DisplayLabelOptions]
+  FilteredPrefixes = ["area/", "platform/"]
+  ExcludedSuffixes = ["documentation"]
+  TrimmedPrefixes = ["area/provider/", "area/middleware/", "area/", "platform/"]

script/gcg/traefik-final-release-part1.toml

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+Owner = "traefik"
+RepositoryName = "traefik"
+
+OutputType = "file"
+FileName = "traefik_changelog.md"
+
+# example final release of v2.3.0
+CurrentRef = "v2.3"
+PreviousRef = "v2.3.0-rc7"
+BaseBranch = "v2.3"
+FutureCurrentRefName = "v2.3.0"
+
+ThresholdPreviousRef = 10
+ThresholdCurrentRef = 10
+
+Debug = true
+DisplayLabel = true
+
+LabelExcludes = ["area/infrastructure"]
+LabelEnhancement = "kind/enhancement"
+LabelDocumentation = "area/documentation"
+LabelBug = "kind/bug/fix"
+
+[DisplayLabelOptions]
+  FilteredPrefixes = ["area/", "platform/"]
+  ExcludedSuffixes = ["documentation"]
+  TrimmedPrefixes = ["area/provider/", "area/middleware/", "area/", "platform/"]

script/gcg/traefik-final-release-part2.toml

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+Owner = "traefik"
+RepositoryName = "traefik"
+
+OutputType = "file"
+FileName = "traefik_changelog.md"
+
+# example final release of v2.3.0
+CurrentRef = "v2.3.0-rc1"
+PreviousRef = "v2.2.0-rc1"
+BaseBranch = "master"
+FutureCurrentRefName = "v2.3.0-rc1"
+
+ThresholdPreviousRef = 10
+ThresholdCurrentRef = 10
+
+Debug = true
+DisplayLabel = true
+
+LabelExcludes = ["area/infrastructure"]
+LabelEnhancement = "kind/enhancement"
+LabelDocumentation = "area/documentation"
+LabelBug = "kind/bug/fix"
+
+[DisplayLabelOptions]
+  FilteredPrefixes = ["area/", "platform/"]
+  ExcludedSuffixes = ["documentation"]
+  TrimmedPrefixes = ["area/provider/", "area/middleware/", "area/", "platform/"]

script/gcg/traefik-rc-first.toml

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+Owner = "traefik"
+RepositoryName = "traefik"
+
+OutputType = "file"
+FileName = "traefik_changelog.md"
+
+# example RC1 of v2.3.0
+CurrentRef = "master"
+PreviousRef = "v2.2.0-rc1"
+BaseBranch = "master"
+FutureCurrentRefName = "v2.3.0-rc1"
+
+ThresholdPreviousRef = 10
+ThresholdCurrentRef = 10
+
+Debug = true
+DisplayLabel = true
+
+LabelExcludes = ["area/infrastructure"]
+LabelEnhancement = "kind/enhancement"
+LabelDocumentation = "area/documentation"
+LabelBug = "kind/bug/fix"
+
+[DisplayLabelOptions]
+  FilteredPrefixes = ["area/", "platform/"]
+  ExcludedSuffixes = ["documentation"]
+  TrimmedPrefixes = ["area/provider/", "area/middleware/", "area/", "platform/"]

script/gcg/traefik-rc-new.toml

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+Owner = "traefik"
+RepositoryName = "traefik"
+
+OutputType = "file"
+FileName = "traefik_changelog.md"
+
+# example RC2 of v2.3.0
+CurrentRef = "v2.3"
+PreviousRef = "v2.3.0-rc1"
+BaseBranch = "v2.3"
+FutureCurrentRefName = "v2.3.0-rc2"
+
+ThresholdPreviousRef = 10
+ThresholdCurrentRef = 10
+
+Debug = true
+DisplayLabel = true
+
+LabelExcludes = ["area/infrastructure"]
+LabelEnhancement = "kind/enhancement"
+LabelDocumentation = "area/documentation"
+LabelBug = "kind/bug/fix"
+
+[DisplayLabelOptions]
+  FilteredPrefixes = ["area/", "platform/"]
+  ExcludedSuffixes = ["documentation"]
+  TrimmedPrefixes = ["area/provider/", "area/middleware/", "area/", "platform/"]