when comparing builder config files, ensure only compare post-processed

Signed-off-by: Avi Deitcher <avi@deitcher.net>

test/cases/040_packages/026_buildkit_config/.gitignore

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+docker-config/

test/cases/040_packages/026_buildkit_config/Dockerfile

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+FROM alpine:3.21
+RUN echo hi

test/cases/040_packages/026_buildkit_config/build.yml

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+org: linuxkit
+image: builder-config

test/cases/040_packages/026_buildkit_config/buildkitd-2.toml

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+# it does not matter what these contents are, as long as they are valid and can be processed
+# and are different than the ones in buildkitd.toml
+debug = true
+# trace = true
+insecure-entitlements = [ "network.host", "security.insecure" ]
+
+[worker.oci]
+  max-parallelism = 48
+[worker.oci.gcpulimits]
+  enabled = true
+
+[log]
+  # log formatter: json or text
+  format = "json"
+
+[registry."172.17.0.2:5001"]
+  insecure = true
+  http = true

test/cases/040_packages/026_buildkit_config/buildkitd.toml

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+# it does not matter what these contents are, as long as they are valid and can be processed
+debug = true
+# trace = true
+insecure-entitlements = [ "network.host", "security.insecure" ]
+
+[worker.oci]
+  max-parallelism = 56
+[worker.oci.gcpulimits]
+  enabled = false
+
+[log]
+  # log formatter: json or text
+  format = "text"
+
+[registry."172.17.0.2:5000"]
+  insecure = true
+  http = true

test/cases/040_packages/026_buildkit_config/test.sh

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+#!/bin/sh
+# SUMMARY: Check that we can access a registry with auth
+# LABELS:
+
+set -e
+
+# Source libraries. Uncomment if needed/defined
+#. "${RT_LIB}"
+. "${RT_PROJECT_ROOT}/_lib/lib.sh"
+
+clean_up() {
+	[ -n "${CACHEDIR}" ] && rm -rf "${CACHEDIR}"
+}
+trap clean_up EXIT
+
+# determine platform
+ARCH=$(uname -m)
+if [ "${ARCH}" = "x86_64" ]; then
+  ARCH="amd64"
+elif [ "${ARCH}" = "aarch64" ]; then
+  ARCH="arm64"
+fi
+PLATFORM="linux/${ARCH}"
+
+CACHEDIR=$(mktemp -d)
+
+# tests:
+# 1. build the local package with the custom buildkitd.toml - should succeed
+# 2. rebuild the local package with the same buildkitd.toml - should succeed without starting a new builder container
+# 3. rebuild the local package with the different buildkitd-2.toml - should succeed after starting a new builder container
+if ! linuxkit --verbose 3 --cache "${CACHEDIR}" pkg build --platforms "${PLATFORM}" \
+  --builder-config "$(pwd)/buildkitd.toml" --force \
+  .; then 
+  echo "Build 1 failed"
+  exit 1
+fi
+CID1=$(docker inspect linuxkit-builder --format '{{.ID}}')
+
+# get the containerd
+
+if ! linuxkit --verbose 3 --cache "${CACHEDIR}" pkg build --platforms "${PLATFORM}" \
+  --builder-config "$(pwd)/buildkitd.toml" --force \
+  .; then 
+  echo "Build 2 failed"
+  exit 1
+fi
+CID2=$(docker inspect linuxkit-builder --format '{{.ID}}')
+
+if ! linuxkit --verbose 3 --cache "${CACHEDIR}" pkg build --platforms "${PLATFORM}" \
+  --builder-config "$(pwd)/buildkitd-2.toml" --force \
+  .; then 
+  echo "Build 3 failed"
+  exit 1
+fi
+CID3=$(docker inspect linuxkit-builder --format '{{.ID}}')
+
+# CID1 and CID2 should match, CID3 should not
+echo "CID1: ${CID1}"
+echo "CID2: ${CID2}"
+echo "CID3: ${CID3}"
+
+if [ "${CID1}" = "${CID2}" ] && [ "${CID2}" != "${CID3}" ]; then
+  echo "Build 1 and 2 used the same builder container, but Build 3 used a different one"
+else
+  echo "Unexpected builder container behavior"
+  exit 1
+fi
+
+exit 0