build: automatically set scalafmt version (#6024)

Automatically append the 'version' configuration parameter to the
scalafmt configuration file when building the image instead of using a
GitHub Actions workflow to keep the scalafmt configuration file up to
date. This makes the building process more reproducible and
self-contained in the Dockerfile, and it also avoid stalling Dependabot
PRs that update scalafmt because when there are automatically added
commits to a PR, they block triggering workflows for that PR.

.github/workflows/sync-scala-version.yaml

@@ -1,39 +0,0 @@
----
-
-name: Sync scala format version between Dockerfile and config file
-
-on:
-  pull_request:
-    paths:
-      - 'Dockerfile'
-
-permissions:
-  contents: write
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v4
-      with:
-        repository: ${{ github.event.pull_request.head.repo.full_name }}
-        ref: ${{ github.event.pull_request.head.ref }}
-
-    - name: Sync the version if the dockerfile is getting updated
-      shell: bash
-      run: |
-        scala_version_from_dockerfile=$(grep 'scalameta/scalafmt' Dockerfile | awk -F: '{print $2}' | awk '{print $1}')
-        scala_version_from_dockerfile=${scala_version_from_dockerfile#v}
-
-        scala_version_from_config=$(grep 'version =' TEMPLATES/.scalafmt.conf | awk -F= '{print $2}' | tr -d '[:space:]')
-
-        echo "scala_version_from_dockerfile: $scala_version_from_dockerfile"
-        echo "scala_version_from_config: $scala_version_from_config"
-
-        if [ "$scala_version_from_dockerfile" != "$scala_version_from_config" ]; then echo "versions differ"; sed -i "s/\(version =\).*/\1 ${scala_version_from_dockerfile}/g" TEMPLATES/.scalafmt.conf; fi
-    - uses: EndBug/add-and-commit@v9 # You can change this to use a specific version.
-      with:
-        add: 'TEMPLATES/.scalafmt.conf'
-        fetch: false
-        message: 'Update scala config version to match version installed'

Dockerfile

@@ -343,6 +343,7 @@ COPY --from=gitleaks /usr/bin/gitleaks /usr/bin/
 # Install scalafmt #
 ####################
 COPY --from=scalafmt /bin/scalafmt /usr/bin/
+RUN scalafmt --version | awk ' { print $2 }' > /tmp/scalafmt-version.txt
 
 ######################
 # Install actionlint #
@@ -436,6 +437,12 @@ RUN /linterVersions.sh \
 ###################################
 COPY TEMPLATES /action/lib/.automation
 
+# Dynamically set scalafmt version in the scalafmt configuration file
+# Ref: https://scalameta.org/scalafmt/docs/configuration.html#version
+COPY --from=base_image /tmp/scalafmt-version.txt /tmp/scalafmt-version.txt
+RUN echo "version = $(cat /tmp/scalafmt-version.txt)" >> /action/lib/.automation/.scalafmt.conf \
+    && rm /tmp/scalafmt-version.txt
+
 #################################
 # Copy super-linter executables #
 #################################
@@ -511,6 +518,12 @@ RUN /linterVersions.sh \
 ###################################
 COPY TEMPLATES /action/lib/.automation
 
+# Dynamically set scalafmt version in the scalafmt configuration file
+# Ref: https://scalameta.org/scalafmt/docs/configuration.html#version
+COPY --from=base_image /tmp/scalafmt-version.txt /tmp/scalafmt-version.txt
+RUN echo "version = $(cat /tmp/scalafmt-version.txt)" >> /action/lib/.automation/.scalafmt.conf \
+    && rm /tmp/scalafmt-version.txt
+
 #################################
 # Copy super-linter executables #
 #################################

TEMPLATES/.scalafmt.conf

@@ -1,7 +1,11 @@
 // Scala Format Configuration
 // https://scalameta.org/scalafmt/docs/configuration.html
-version = 3.8.2
-align.preset = more    // For pretty alignment.
+align.preset = more
 maxColumn = 80
 // https://scalameta.org/scalafmt/docs/configuration.html#scala-dialects
 runner.dialect = scala3
+
+// The version parameter is required to be specified explicitly
+// Ref: https://scalameta.org/scalafmt/docs/configuration.html#version
+// It will be added at the end of this file when building the Super-linter
+// container image