(maint) update clj-parent, enable pr testing, linting

This updates clj-parent to 5.5.0, adds pr testing for the repo
and adds clojure linting.

.clj-kondo/config.edn

@@ -0,0 +1,2 @@
+{:linters {:refer-all {:exclude [clojure.test slingshot.test]}}
+ :output {:linter-name true}}

.github/workflows/clojure-linting.yaml

@@ -0,0 +1,30 @@
+name: Clojure Linting
+
+on:
+  pull_request:
+    types: [opened, reopened, edited, synchronize]
+    paths: ['src/**','test/**','.clj-kondo/config.edn','project.clj','.github/**']
+
+jobs:
+  clojure-linting:
+    name: Clojure Linting
+    runs-on: ubuntu-latest
+    steps:
+      - name: setup java
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 17
+      - name: checkout repo
+        uses: actions/checkout@v3
+      - name: install clj-kondo (this is quite fast)
+        run: |
+          curl -sLO https://raw.githubusercontent.com/clj-kondo/clj-kondo/master/script/install-clj-kondo
+          chmod +x install-clj-kondo
+          ./install-clj-kondo --dir .
+      - name: kondo lint
+        run: ./clj-kondo --lint src test
+      - name: eastwood lint
+        run: |
+          java -version
+          lein eastwood

.github/workflows/pr-testing.yaml

@@ -0,0 +1,29 @@
+name: PR Testing
+
+on:
+  workflow_dispatch:
+  pull_request:
+    types: [opened, reopened, edited, synchronize]
+    paths: ['src/**','test/**','project.clj']
+
+jobs:
+  pr-testing:
+    name: PR Testing
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ['11', '17']
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout repo
+        uses: actions/checkout@v3
+        with:
+          submodules: recursive
+      - name: setup java
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: ${{ matrix.version }}
+      - name: clojure tests
+        run: lein test
+        timeout-minutes: 30

project.clj

@@ -6,7 +6,7 @@
 
   :min-lein-version "2.7.1"
 
-  :parent-project {:coords [puppetlabs/clj-parent "5.3.0"]
+  :parent-project {:coords [puppetlabs/clj-parent "5.5.0"]
                    :inherit [:managed-dependencies]}
 
   ;; Abort when version ranges or version conflicts are detected in
@@ -50,6 +50,7 @@
 
   ;; this plugin is used by jenkins jobs to interrogate the project version
   :plugins [[lein-parent "0.3.9"]
+            [jonase/eastwood "1.2.2" :exclusions [org.clojure/clojure]]
             [puppetlabs/i18n "0.9.2"]]
 
   :lein-release        {:scm          :git