do not set environment variables

These variables were used only once.

.github/workflows/annocheck.yml

@@ -43,18 +43,6 @@ jobs:
     if: ${{ !contains(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
 
     env:
-      # -g0 disables backtraces when SEGV.  Do not set that.
-      debugflags: '-ggdb3'
-
-      default_configure: >-
-        --enable-debug-env
-        --disable-install-doc
-        --with-ext=-test-/cxxanyargs,+
-      append_configure: >-
-        --without-valgrind
-        --without-jemalloc
-        --without-gmp
-
       CONFIGURE_TTY: never
       GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
       RUBY_DEBUG: ci rgengc
@@ -62,9 +50,6 @@ jobs:
         -q
         --color=always
         --tty=no
-      # Minimal flags to pass the check.
-      optflags: '-O2'
-      LDFLAGS: '-Wl,-z,now'
       # FIXME: Drop skipping options
       # https://bugs.ruby-lang.org/issues/18061
       # https://sourceware.org/annobin/annobin.html/Test-pie.html
@@ -85,11 +70,22 @@ jobs:
           builddir: build
           makeup: true
 
+      # Minimal flags to pass the check.
+      # -g0 disables backtraces when SEGV.  Do not set that.
       - name: Run configure
         run: >
-          ../src/configure -C ${default_configure} ${append_configure}
+          ../src/configure -C
+          --enable-debug-env
+          --disable-install-doc
+          --with-ext=-test-/cxxanyargs,+
+          --without-valgrind
+          --without-jemalloc
+          --without-gmp
           --with-gcc="gcc-11 -fcf-protection -Wa,--generate-missing-build-notes=yes"
           --enable-shared
+          debugflags=-ggdb3
+          optflags=-O2
+          LDFLAGS=-Wl,-z,now
 
       - run: make showflags