ci: work around corepack integrity keys issue

Dockerfile

@@ -6,7 +6,8 @@
 # build
 FROM node:22-alpine AS build
 
-RUN corepack enable
+# @see https://github.com/nodejs/corepack/issues/612
+RUN COREPACK_INTEGRITY_KEYS='{"npm":[{"expires":"2025-01-29T00:00:00.000Z","keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","keytype":"ecdsa-sha2-nistp256","scheme":"ecdsa-sha2-nistp256","key":"MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE1Olb3zMAFFxXKHiIkQO5cJ3Yhl5i6UPp+IhuteBJbuHcA5UogKo0EWtlWwW6KSaKoTNEYL7JlCQiVnkhBktUgg=="},{"expires":null,"keyid":"SHA256:DhQ8wR5APBvFHLF/+Tc+AYvPOdTpcIDqOhxsBHRwC7U","keytype":"ecdsa-sha2-nistp256","scheme":"ecdsa-sha2-nistp256","key":"MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEY6Ya7W++7aUPzvMTrezH6Ycx3c+HOKYCcNGybJZSCJq/fd7Qa8uuAKtdIkUQtQiEKERhAmE5lMMJhP8OkDOa2g=="}]}' corepack enable
 
 RUN mkdir /app && chown -R node:node /app
 WORKDIR /app