feat: turn repository into a Github action

.github/dependabot.yaml

@@ -14,6 +14,20 @@ updates:
       update-types:
       - "minor"
       - "patch"
+- package-ecosystem: docker
+  commit-message:
+    prefix: chore
+    include: scope
+  directory: /
+  schedule:
+    interval: monthly
+  groups:
+    docker:
+      patterns:
+      - "*"
+      update-types:
+      - "minor"
+      - "patch"
 - package-ecosystem: gomod
   commit-message:
     prefix: chore

Dockerfile

@@ -0,0 +1,10 @@
+FROM alpine:3.20
+RUN apk --no-cache add curl git jq \
+    && (if echo "$TARGETPLATFORM" | grep -q arm; then \
+    curl -sSL $(curl -s https://api.github.com/repos/smlx/ccv/releases/latest | jq -r '.assets[].browser_download_url | select(test("linux_arm64"))'); \
+    else \
+    curl -sSL $(curl -s https://api.github.com/repos/smlx/ccv/releases/latest | jq -r '.assets[].browser_download_url | select(test("linux_amd64"))'); \
+    fi) \
+    | tar -xz -C /usr/local/bin ccv
+COPY entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

action.yaml

@@ -0,0 +1,10 @@
+name: Conventional Commits Versioner Action
+description: Automatically tag a new version based on the commit messages of commits since the last tag.
+outputs:
+  new_tag:
+    description: Either "true" or "false" depending on whether a new tag was pushed.
+  new_tag_version:
+    description: The new version that was tagged. This will only be set if new_tag=true.
+runs:
+  using: docker
+  image: Dockerfile

entrypoint.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+set -eu
+# https://docs.github.com/en/actions/creating-actions/creating-a-docker-container-action#accessing-files-created-by-a-container-action
+cd /github/workspace
+# if the ccv tag exists, just exit
+if [ "$(git tag -l "$(ccv)")" ]; then
+	echo "new_tag=false" >>"$GITHUB_OUTPUT"
+	exit
+fi
+# if it doesn't, tag and push
+git tag "$(ccv)"
+git push --tags
+echo "new_tag=true" >>"$GITHUB_OUTPUT"
+echo "new_tag_version=$(git tag --points-at HEAD)" >>"$GITHUB_OUTPUT"