fix: strip CRLF from inputs + add .gitattributes (eol=lf) -- fixes ssh username 'invalid characters'

kubectl-apply/action.yaml

@@ -63,7 +63,8 @@ runs:
       env:
         KUBE_CONFIG: ${{ inputs.kube_config }}
       run: |
-        echo "${KUBE_CONFIG}" > kubeconfig.yaml
+        # strip stray CR (CRLF checkout via core.autocrlf)
+        printf '%s' "${KUBE_CONFIG}" | tr -d '\r' > kubeconfig.yaml
         kubectl --kubeconfig=kubeconfig.yaml cluster-info
 
     - name: Apply manifests
@@ -73,6 +74,11 @@ runs:
         MANIFESTS: ${{ inputs.manifests }}
         NAMESPACE: ${{ inputs.namespace }}
       run: |
+        # strip stray CR (CRLF checkout via core.autocrlf)
+        NAMESPACE=$(printf '%s' "${NAMESPACE}" | tr -d '\r')
+        MANIFEST=$(printf '%s' "${MANIFEST}" | tr -d '\r')
+        MANIFESTS=$(printf '%s' "${MANIFESTS}" | tr -d '\r')
+
         NS_FLAG=""
         if [ -n "${NAMESPACE}" ] && [ "${NAMESPACE// }" != "" ]; then
           NS_FLAG="-n ${NAMESPACE}"