scripts/installer.sh: remove unnecessary escaping in grep

Updates #11263

Signed-off-by: Andrew Lytvynov <awly@tailscale.com>

.github/workflows/installer.yml

@@ -32,7 +32,6 @@ jobs:
           - "ubuntu:18.04"
           - "ubuntu:20.04"
           - "ubuntu:22.04"
-          - "ubuntu:22.10"
           - "ubuntu:23.04"
           - "elementary/docker:stable"
           - "elementary/docker:unstable"
@@ -91,7 +90,10 @@ jobs:
         || contains(matrix.image, 'parrotsec')
         || contains(matrix.image, 'kalilinux')
     - name: checkout
-      uses: actions/checkout@v4
+      # We cannot use v4, as it requires a newer glibc version than some of the
+      # tested images provide. See
+      # https://github.com/actions/checkout/issues/1487
+      uses: actions/checkout@v3
     - name: run installer
       run: scripts/installer.sh
       # Package installation can fail in docker because systemd is not running

scripts/installer.sh

@@ -527,7 +527,7 @@ main() {
 			;;
 		apk)
 			set -x
-			if ! grep -Eq '^http.*\/community$' /etc/apk/repositories; then
+			if ! grep -Eq '^http.*/community$' /etc/apk/repositories; then
 				if type setup-apkrepos >/dev/null; then
 					$SUDO setup-apkrepos -c -1
 				else