gh-112088: Run autoreconf in GHA check_generated_files (#112090)

The "Check if generated files are up to date" job of GitHub Actions
now runs the "autoreconf -ivf -Werror" command instead of the "make
regen-configure" command to avoid depending on the external quay.io
server.

Add Tools/build/regen-configure.sh script to regenerate the configure
with an Ubuntu container image. The
"quay.io/tiran/cpython_autoconf:271" container image
(https://github.com/tiran/cpython_autoconf) is no longer used.

.github/workflows/build.yml

@@ -120,7 +120,9 @@ jobs:
 
   check_generated_files:
     name: 'Check if generated files are up to date'
-    runs-on: ubuntu-latest
+    # Don't use ubuntu-latest but a specific version to make the job
+    # reproducible: to get the same tools versions (autoconf, aclocal, ...)
+    runs-on: ubuntu-22.04
     timeout-minutes: 60
     needs: check_source
     if: needs.check_source.outputs.run_tests == 'true'
@@ -143,15 +145,16 @@ jobs:
       - name: Check Autoconf and aclocal versions
         run: |
           grep "Generated by GNU Autoconf 2.71" configure
-          grep "aclocal 1.16.4" aclocal.m4
+          grep "aclocal 1.16.5" aclocal.m4
           grep -q "runstatedir" configure
           grep -q "PKG_PROG_PKG_CONFIG" aclocal.m4
       - name: Configure CPython
         run: |
           # Build Python with the libpython dynamic library
           ./configure --config-cache --with-pydebug --enable-shared
-      - name: Regenerate autoconf files with container image
-        run: make regen-configure
+      - name: Regenerate autoconf files
+        # Same command used by Tools/build/regen-configure.sh ($AUTORECONF)
+        run: autoreconf -ivf -Werror
       - name: Build CPython
         run: |
           make -j4 regen-all

.github/workflows/posix-deps-apt.sh

@@ -1,9 +1,11 @@
 #!/bin/sh
 apt-get update
 
+# autoconf-archive is needed by autoreconf (check_generated_files job)
 apt-get -yq install \
     build-essential \
     pkg-config \
+    autoconf-archive \
     ccache \
     gdb \
     lcov \