MINOR: make sequential package execution optional in test task

The test task previously hardcoded -p 1, forcing all test packages to
run sequentially. This is required for integration tests (each package
starts its own envtest and HAProxy instance, causing port races when run
in parallel) but unnecessarily restrictive for unit-only runs.

Add a SEQUENTIAL variable (default false, meaning no -p flag is passed
and Go uses its own default). Set SEQUENTIAL=true to restore the -p 1
behaviour needed for integration test packages.

Author: ivanmatmati

taskfile.yml

@@ -80,6 +80,7 @@ tasks:
       TOOL: envtest
       PKG: '{{default "./..." .PKG}}'
       FORMAT: '{{default "testdox" .FORMAT}}'
+      SEQUENTIAL: '{{default "false" .SEQUENTIAL}}'
       POD_IP: "1.2.3.4"
       POD_NAME: "hug-7469984948-qgnfw"
       POD_NAMESPACE: "hug"
@@ -98,7 +99,7 @@ tasks:
           --format={{.FORMAT}} \
           --format-hide-empty-pkg \
           -- -count=1 \
-            -p 1 \
+            {{if eq .SEQUENTIAL "true"}}-p 1{{end}}\
             -tags="{{.TEST_TAGS}}" \
             -failfast \
             -v \

taskfile/conformance.yml

@@ -207,6 +207,7 @@ tasks:
       CONFORMANCE_JUNIT_HTML_OUTPUT: '{{default "conformance-junit.html" .CONFORMANCE_JUNIT_HTML_OUTPUT}}'
       CONFORMANCE_RUN_TEST: '{{default "" .CONFORMANCE_RUN_TEST}}'
       CONFORMANCE_SKIP_TESTS: '{{default "" .CONFORMANCE_SKIP_TESTS}}'
+      SEQUENTIAL: '{{default "false" .SEQUENTIAL}}'
     cmds:
       - |
         if CONFORMANCE_REPORT_OUTPUT={{.CONFORMANCE_REPORT_OUTPUT}} \
@@ -220,7 +221,7 @@ tasks:
               -tags=conformance \
               -timeout 60m \
               -v \
-              -p 1 \
+              {{if eq .SEQUENTIAL "true"}}-p 1{{end}}\
               -failfast \
               {{if .CONFORMANCE_RUN_TEST}}-run-test '{{.CONFORMANCE_RUN_TEST}}'{{end}} \
               {{if .CONFORMANCE_SKIP_TESTS}}-skip-tests '{{.CONFORMANCE_SKIP_TESTS}}'{{end}}; then