Check for credentials before every commit

In order to use, it cred-alert needs to be installed.
Also, we enable the usage of rubocop.

Co-authored-by: David Ansari <david.ansari@sap.com>

.envrc

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+if [ ! -f $PWD/.git/hooks/pre-commit ]; then
+  ln -s $PWD/git-hooks/pre-commit $PWD/.git/hooks/pre-commit
+fi

git-hooks/pre-commit

@@ -1,2 +1,17 @@
+#!/bin/bash
+
+set -euo pipefail
+
+RED='\033[0;35m'
+NC='\033[0m' # No Color
+
+if hash cred-alert-cli 2>/dev/null; then
+  CMD="git diff --cached | cred-alert-cli scan --diff"
+  echo "Running '${CMD}'"
+  eval "$CMD"
+else
+  >&2 echo -e "${RED}Not checking whether credentials get committed. cred-alert-cli is not installed.${NC}"
+fi
+
 unset GIT_DIR
 scripts/rubocop-staged