Update workflows and configurations for CI and code quality

.gitattributes

@@ -0,0 +1,47 @@
+# Default behavior:
+* text=auto eol=lf
+
+# Python files
+*.py      text eol=lf
+
+# Configuration and text files
+*.toml    text eol=lf
+*.ini     text eol=lf
+*.cfg     text eol=lf
+*.md      text eol=lf
+*.txt     text eol=lf
+*.json    text eol=lf
+*.yml     text eol=lf
+*.yaml          text eol=lf
+.editorconfig   text eol=lf
+.gitignore      text eol=lf
+.gitattributes  text eol=lf
+
+# Lock files should be treated as text with LF endings
+uv.lock  text eol=lf
+
+# Make Jupyter Notebook diffs readable
+# Requires users to install nbdime (pip install nbdime)
+# and run `nbdime config-git --enable --global`
+*.ipynb   diff=nbdime
+
+# Mark binary files to prevent Git from trying to change their line endings
+# This prevents corruption of these files.
+*.png     binary
+*.jpg     binary
+*.jpeg    binary
+*.gif     binary
+*.ico     binary
+*.pyc     binary
+*.so      binary
+*.sqlite3 binary
+*.db      binary
+*.zip     binary
+*.gz      binary
+*.pdf     binary
+
+# Exclude specific files/directories from git archive (e.g., when downloading a zip)
+# This is great for providing students with a clean project download.
+/.github        export-ignore
+/tests/         export-ignore
+/.pytest_cache/ export-ignore

.github/workflows/build.yml

@@ -10,21 +10,22 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
-      - name: Set up JDK 17
-        uses: actions/setup-java@v1
+      - name: Set up JDK 25
+        uses: actions/setup-java@v5
         with:
-          java-version: 17
+          distribution: 'temurin'
+          java-version: 25
       - name: Cache SonarCloud packages
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         with:
           path: ~/.sonar/cache
           key: ${{ runner.os }}-sonar
           restore-keys: ${{ runner.os }}-sonar
       - name: Cache Gradle packages
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}

.github/workflows/qodana_code_quality.yml

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+#-------------------------------------------------------------------------------#
+#            Discover all capabilities of Qodana in our documentation           #
+#             https://www.jetbrains.com/help/qodana/about-qodana.html           #
+#-------------------------------------------------------------------------------#
+
+name: Qodana
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - master
+      - chore/versoins-bump
+
+jobs:
+  qodana:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+      checks: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          fetch-depth: 0
+      - name: 'Qodana Scan'
+        uses: JetBrains/qodana-action@v2025.3
+        env:
+          QODANA_TOKEN: ${{ secrets.QODANA_TOKEN }}
+        with:
+          # When pr-mode is set to true, Qodana analyzes only the files that have been changed
+          pr-mode: false
+          use-caches: true
+          post-pr-comment: true
+          use-annotations: true
+          # Upload Qodana results (SARIF, other artifacts, logs) as an artifact to the job
+          upload-result: false
+          # quick-fixes available in Ultimate and Ultimate Plus plans
+          push-fixes: 'none'

qodana.yaml

@@ -0,0 +1,49 @@
+#-------------------------------------------------------------------------------#
+#               Qodana analysis is configured by qodana.yaml file               #
+#             https://www.jetbrains.com/help/qodana/qodana-yaml.html            #
+#-------------------------------------------------------------------------------#
+
+#################################################################################
+#              WARNING: Do not store sensitive information in this file,        #
+#               as its contents will be included in the Qodana report.          #
+#################################################################################
+version: "1.0"
+
+#Specify inspection profile for code analysis
+profile:
+  name: qodana.starter
+
+#Enable inspections
+#include:
+#  - name: <SomeEnabledInspectionId>
+
+#Disable inspections
+#exclude:
+#  - name: <SomeDisabledInspectionId>
+#    paths:
+#      - <path/where/not/run/inspection>
+
+projectJDK: "17" #(Applied in CI/CD pipeline)
+
+#Execute shell command before Qodana execution (Applied in CI/CD pipeline)
+#bootstrap: sh ./prepare-qodana.sh
+
+#Install IDE plugins before Qodana execution (Applied in CI/CD pipeline)
+#plugins:
+#  - id: <plugin.id> #(plugin id can be found at https://plugins.jetbrains.com)
+
+# Quality gate. Will fail the CI/CD pipeline if any condition is not met
+# severityThresholds - configures maximum thresholds for different problem severities
+# testCoverageThresholds - configures minimum code coverage on a whole project and newly added code
+# Code Coverage is available in Ultimate and Ultimate Plus plans
+#failureConditions:
+#  severityThresholds:
+#    any: 15
+#    critical: 5
+#  testCoverageThresholds:
+#    fresh: 70
+#    total: 50
+
+#Qodana supports other languages, for example, Python, JavaScript, TypeScript, Go, C#, PHP
+#For all supported languages see https://www.jetbrains.com/help/qodana/linters.html
+linter: jetbrains/qodana-jvm-community:2026.1