fix: background reader apart from global handler for testing

[spiffcs]

Add individual WG to background reader to track/block on buffer being read for snapshot tests

This should fix the race condition in CI rather than bumping iterations n number of times like we had in the past

[github-actions]

Benchmark Test Results

Benchmark results from the latest changes vs base branch

goos: linux%0Agoarch: amd64%0Apkg: github.com/anchore/syft/test/integration%0Acpu: Intel(R) Xeon(R) Platinum 8171M CPU @ 2.60GHz%0A                                                          │ ./.tmp/benchmark-a7523a8.txt │%0A                                                          │            sec/op            │%0AImagePackageCatalogers/alpmdb-cataloger-2                                   14.05m ±  3%25%0AImagePackageCatalogers/apkdb-cataloger-2                                    853.5µ ±  1%25%0AImagePackageCatalogers/binary-cataloger-2                                   236.1µ ±  3%25%0AImagePackageCatalogers/dpkgdb-cataloger-2                                   705.3µ ±  2%25%0AImagePackageCatalogers/dotnet-deps-cataloger-2                              1.447m ±  1%25%0AImagePackageCatalogers/go-module-binary-cataloger-2                         109.1µ ±  1%25%0AImagePackageCatalogers/java-cataloger-2                                     16.14m ±  1%25%0AImagePackageCatalogers/graalvm-native-image-cataloger-2                     105.6µ ±  2%25%0AImagePackageCatalogers/javascript-package-cataloger-2                       479.3µ ± 24%25%0AImagePackageCatalogers/nix-store-cataloger-2                                330.0µ ±  1%25%0AImagePackageCatalogers/php-composer-installed-cataloger-2                   952.8µ ±  1%25%0AImagePackageCatalogers/portage-cataloger-2                                  570.4µ ±  1%25%0AImagePackageCatalogers/python-package-cataloger-2                           4.003m ±  1%25%0AImagePackageCatalogers/r-package-cataloger-2                                241.2µ ±  1%25%0AImagePackageCatalogers/rpm-db-cataloger-2                                   649.4µ ±  3%25%0AImagePackageCatalogers/ruby-gemspec-cataloger-2                             1.110m ±  1%25%0AImagePackageCatalogers/sbom-cataloger-2                                     141.3µ ±  1%25%0Ageomean                                                                     728.1µ%0A%0A                                                          │ ./.tmp/benchmark-a7523a8.txt │%0A                                                          │             B/op             │%0AImagePackageCatalogers/alpmdb-cataloger-2                                   5.116Mi ± 0%25%0AImagePackageCatalogers/apkdb-cataloger-2                                    204.8Ki ± 0%25%0AImagePackageCatalogers/binary-cataloger-2                                   30.24Ki ± 0%25%0AImagePackageCatalogers/dpkgdb-cataloger-2                                   168.9Ki ± 0%25%0AImagePackageCatalogers/dotnet-deps-cataloger-2                              405.3Ki ± 0%25%0AImagePackageCatalogers/go-module-binary-cataloger-2                         9.906Ki ± 0%25%0AImagePackageCatalogers/java-cataloger-2                                     2.827Mi ± 0%25%0AImagePackageCatalogers/graalvm-native-image-cataloger-2                     8.594Ki ± 0%25%0AImagePackageCatalogers/javascript-package-cataloger-2                       100.9Ki ± 0%25%0AImagePackageCatalogers/nix-store-cataloger-2                                49.14Ki ± 0%25%0AImagePackageCatalogers/php-composer-installed-cataloger-2                   186.7Ki ± 0%25%0AImagePackageCatalogers/portage-cataloger-2                                  119.9Ki ± 0%25%0AImagePackageCatalogers/python-package-cataloger-2                           1.003Mi ± 0%25%0AImagePackageCatalogers/r-package-cataloger-2                                53.30Ki ± 0%25%0AImagePackageCatalogers/rpm-db-cataloger-2                                   180.9Ki ± 0%25%0AImagePackageCatalogers/ruby-gemspec-cataloger-2                             144.0Ki ± 0%25%0AImagePackageCatalogers/sbom-cataloger-2                                     14.20Ki ± 0%25%0Ageomean                                                                     132.7Ki%0A%0A                                                          │ ./.tmp/benchmark-a7523a8.txt │%0A                                                          │          allocs/op           │%0AImagePackageCatalogers/alpmdb-cataloger-2                                    87.74k ± 0%25%0AImagePackageCatalogers/apkdb-cataloger-2                                     4.182k ± 0%25%0AImagePackageCatalogers/binary-cataloger-2                                     830.0 ± 0%25%0AImagePackageCatalogers/dpkgdb-cataloger-2                                    3.002k ± 0%25%0AImagePackageCatalogers/dotnet-deps-cataloger-2                               6.338k ± 0%25%0AImagePackageCatalogers/go-module-binary-cataloger-2                           281.0 ± 0%25%0AImagePackageCatalogers/java-cataloger-2                                      39.88k ± 0%25%0AImagePackageCatalogers/graalvm-native-image-cataloger-2                       228.0 ± 0%25%0AImagePackageCatalogers/javascript-package-cataloger-2                        1.404k ± 0%25%0AImagePackageCatalogers/nix-store-cataloger-2                                  895.0 ± 0%25%0AImagePackageCatalogers/php-composer-installed-cataloger-2                    4.079k ± 0%25%0AImagePackageCatalogers/portage-cataloger-2                                   2.268k ± 0%25%0AImagePackageCatalogers/python-package-cataloger-2                            16.44k ± 0%25%0AImagePackageCatalogers/r-package-cataloger-2                                  929.0 ± 0%25%0AImagePackageCatalogers/rpm-db-cataloger-2                                    3.989k ± 0%25%0AImagePackageCatalogers/ruby-gemspec-cataloger-2                              2.447k ± 0%25%0AImagePackageCatalogers/sbom-cataloger-2                                       394.0 ± 0%25%0Ageomean                                                                      2.583k

[wagoodman]

thanks for digging on this 🙌