* fix(php-8.5-grpc): add pipefail and use grep -F in tests

Add `set -euo pipefail` to test runs blocks that contain unix
pipes, so failures in earlier pipeline stages are not silently
masked. Also change `grep -q` to `grep -qF` for literal string
matching as required by test pattern conventions.

* fix(php-8.5-grpc): bump epoch to trigger rebuild

Increment epoch from 0 to 1 in os/php-8.5-grpc.yaml to satisfy
the epoch-bot requirement that changed files include an epoch bump.

* fix(php-8.5-grpc): make test robust on x86_64 qemu runner

The test was failing on x86_64 with "gRPC extension not loaded"
because the ini file may not be in place in the qemu test
environment. Add a fallback to create the ini file if missing,
following the pattern used in php-8.5-redis.yaml.

Also remove the redundant php-8.5-grpc entry from the test
environment packages since it is the package under test and is
automatically included by melange.

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Co-authored-by: skillup <skillup@chainguard.dev>

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