feat: Add pre-commit hooks for automated code quality checks

.pre-commit-config.yaml

@@ -0,0 +1,22 @@
+repos:
+  - repo: https://github.com/psf/black
+    rev: 24.2.0
+    hooks:
+      - id: black
+        files: ^(common|example)/.*\.py$
+        exclude: .*upstream.*
+
+  - repo: https://github.com/adrienverge/yamllint
+    rev: v1.35.1
+    hooks:
+      - id: yamllint
+        files: ^(common|example|hack|tests|\.github)/.*\.ya?ml$
+        exclude: .*upstream.*
+        args: [--config-file=.yamllint.yaml]
+
+  - repo: https://github.com/shellcheck-py/shellcheck-py
+    rev: v0.9.0.6
+    hooks:
+      - id: shellcheck
+        files: ^.*\.sh$
+        exclude: (^apps/.*|.*upstream.*)

contrib/spark/test.sh

@@ -4,8 +4,6 @@ set -euxo
 
 NAMESPACE=$1
 TIMEOUT=120  # timeout in seconds
-SLEEP_INTERVAL=30  # interval between checks in seconds
-SPARK_VERSION=3.5.2
 
 start_time=$(date +%s)
 for ((i=0; i<TIMEOUT; i+=2)); do

tests/gh-actions/install_knative-cni.sh

@@ -5,9 +5,8 @@ echo "Installing KNative with Istio-CNI ..."
 
 # Retry mechanism for applying Knative manifests
 set +e
-for i in {1..5}; do
-    kustomize build common/knative/knative-serving/base | kubectl apply -f -
-    if [[ $? -eq 0 ]]; then
+for _ in {1..5}; do
+    if kustomize build common/knative/knative-serving/base | kubectl apply -f -; then
         break
     fi
     echo "Retrying in 30 seconds..."

tests/gh-actions/install_knative.sh

@@ -5,9 +5,8 @@ echo "Installing KNative ..."
 
 # Retry mechanism for applying Knative manifests
 set +e
-for i in {1..5}; do
-    kustomize build common/knative/knative-serving/base | kubectl apply -f -
-    if [[ $? -eq 0 ]]; then
+for _ in {1..5}; do
+    if kustomize build common/knative/knative-serving/base | kubectl apply -f -; then
         break
     fi
     echo "Retrying in 30 seconds..."