fix(ci): Enable IPv6 in Playwright containers for loopback networking

Docker containers don't have IPv6 enabled on the loopback interface by
default. Node.js fetch resolves localhost to ::1 (IPv6) first, which
fails when IPv6 is disabled. This breaks E2E tests that do server-side
self-referencing fetch (e.g., Astro SSR fetching its own API endpoints).

Enable IPv6 via --sysctl net.ipv6.conf.all.disable_ipv6=0 on all
container jobs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mydea

.github/workflows/build.yml

@@ -500,7 +500,7 @@ jobs:
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
-      options: --ipc=host --user root
+      options: --ipc=host --user root --sysctl net.ipv6.conf.all.disable_ipv6=0
     timeout-minutes: 25
     strategy:
       fail-fast: false
@@ -606,7 +606,7 @@ jobs:
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
-      options: --ipc=host --user root
+      options: --ipc=host --user root --sysctl net.ipv6.conf.all.disable_ipv6=0
     timeout-minutes: 15
     strategy:
       fail-fast: false
@@ -826,7 +826,7 @@ jobs:
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
-      options: --ipc=host --user root
+      options: --ipc=host --user root --sysctl net.ipv6.conf.all.disable_ipv6=0
     timeout-minutes: 15
     strategy:
       fail-fast: false
@@ -930,7 +930,7 @@ jobs:
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
-      options: --ipc=host --user root
+      options: --ipc=host --user root --sysctl net.ipv6.conf.all.disable_ipv6=0
     timeout-minutes: 15
     env:
       # We just use a dummy DSN here, only send to the tunnel anyhow
@@ -1055,7 +1055,7 @@ jobs:
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
-      options: --ipc=host --user root
+      options: --ipc=host --user root --sysctl net.ipv6.conf.all.disable_ipv6=0
     timeout-minutes: 15
     env:
       E2E_TEST_AUTH_TOKEN: ${{ secrets.E2E_TEST_AUTH_TOKEN }}

.github/workflows/canary.yml

@@ -77,7 +77,7 @@ jobs:
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
-      options: --ipc=host --user root
+      options: --ipc=host --user root --sysctl net.ipv6.conf.all.disable_ipv6=0
     timeout-minutes: 20
     env:
       # We just use a dummy DSN here, only send to the tunnel anyhow

.github/workflows/flaky-test-detector.yml

@@ -45,7 +45,7 @@ jobs:
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
-      options: --ipc=host --user root
+      options: --ipc=host --user root --sysctl net.ipv6.conf.all.disable_ipv6=0
     timeout-minutes: 60
     name: 'Check tests for flakiness'
     # Also skip if PR is from master -> develop