cicd: get skip and build values from pyproject

When cicd disables tests it also overrides skip and build values.
To make it work we need to populate them back via environment.
Let's read them from pyproject.tom which will not require keep them in
sync.

Author: dkropachev

.github/workflows/lib-build-and-push.yml

@@ -98,8 +98,8 @@ jobs:
           echo "CIBW_TEST_COMMAND=true" >> $GITHUB_ENV;
           echo "CIBW_TEST_COMMAND_WINDOWS=(exit 0)" >> $GITHUB_ENV;
           echo "CIBW_TEST_SKIP=*" >> $GITHUB_ENV;
-          echo "CIBW_SKIP=cp2* cp36* pp36* cp37* pp37* cp38* pp38* cp39* pp39* *i686 *musllinux*" >> $GITHUB_ENV;
-          echo "CIBW_BUILD=cp3* pp3*" >> $GITHUB_ENV;
+          echo "CIBW_SKIP=`scripts/get-pyproject-value.sh tool.cibuildwheel skip`" >> $GITHUB_ENV;
+          echo "CIBW_BUILD=`scripts/get-pyproject-value.sh tool.cibuildwheel build`" >> $GITHUB_ENV;
           echo "CIBW_BEFORE_TEST=true" >> $GITHUB_ENV;
           echo "CIBW_BEFORE_TEST_WINDOWS=(exit 0)" >> $GITHUB_ENV;
 

scripts/get-pyproject-value.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+TARGET_SECTION=${1:?section name like tool.cibuildwheel}
+TARGET_FIELD=${2:?field name like skip or build-frontend}
+
+# Resolve pyproject.toml relative to script location
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PYPROJECT_FILE="$SCRIPT_DIR/../pyproject.toml"
+
+awk -v sec="$TARGET_SECTION" -v field="$TARGET_FIELD" '
+  /^\[/ {
+    # exact match on section header, treat dots literally
+    in_section = ($0 == "[" sec "]")
+  }
+
+  in_section {
+    # Match "field = ..."
+    if (match($0, "^[ \t]*" field "[ \t]*=")) {
+      rhs = substr($0, RSTART + RLENGTH)
+      gsub(/^[ \t]+/, "", rhs)
+
+      if (rhs ~ /^\[/) {
+        # Multiline or inline array
+        buf = rhs
+        while (buf !~ /\]/ && (getline > 0)) buf = buf " " $0
+        if (match(buf, /\[(.*)\]/, m)) {
+          s = m[1]
+          gsub(/["'\'' ,]/, " ", s)
+          gsub(/[ \t]+/, " ", s)
+          gsub(/^[ \t]+|[ \t]+$/, "", s)
+          print s
+          exit
+        }
+      } else {
+        # Scalar string or number, like "build[uv]"
+        s = rhs
+        gsub(/^["'\'' ]+|["'\'' ]+$/, "", s)
+        print s
+        exit
+      }
+    }
+  }
+' "$PYPROJECT_FILE"