feat: automatically handle ktlint updates (#5049)

.github/dependabot.yml

@@ -65,6 +65,14 @@ updates:
       interval: "weekly"
     open-pull-requests-limit: 10
 
+  - package-ecosystem: "gradle"
+    commit-message:
+      prefix: "deps(java)"
+    directory: "/dependencies/ktlint"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+
   # Maintain dev dependencies for docker
   - package-ecosystem: "docker"
     commit-message:

Dockerfile

@@ -252,7 +252,6 @@ RUN /install-clj-kondo.sh && rm -rf /install-clj-kondo.sh
 ##################
 # Install ktlint #
 ##################
-ARG KTLINT_VERSION='0.47.1'
 COPY scripts/install-ktlint.sh /
 RUN --mount=type=secret,id=GITHUB_TOKEN /install-ktlint.sh && rm -rf /install-ktlint.sh
 

dependencies/ktlint/build.gradle

@@ -0,0 +1,12 @@
+repositories {
+  mavenLocal()
+  mavenCentral()
+}
+
+// Hold this dependency here so we can get automated updates using DependaBot
+dependencies {
+  implementation 'com.pinterest.ktlint:ktlint-cli:0.47.1'
+}
+
+group 'com.github.super-linter'
+version '1.0.0-SNAPSHOT'

scripts/install-ktlint.sh

@@ -2,6 +2,12 @@
 
 set -euo pipefail
 
+KTLINT_VERSION="$(
+  set -euo pipefail
+  grep <"ktlint/build.gradle" "ktlint" | awk -F ':' '{print $3}' | tr -d "'"
+)"
+echo "Installing Ktlint: ${KTLINT_VERSION}"
+
 url=$(
   set -euo pipefail
   curl -s \