ci: add v build-examples steps to the sanitize jobs (#9655)

Author: ka-weihe

.github/workflows/ci.yml

@@ -553,6 +553,8 @@ jobs:
         run: make -j4 && ./v -cg -cflags -Werror -o v cmd/v
       - name: Self tests (-fsanitize=undefined)
         run: ./v -cflags "-fsanitize=undefined" -o v2 cmd/v && ./v2 -cflags -fsanitize=undefined test-self
+      - name: Build examples (V compiled with -fsanitize=undefined)
+        run: ./v2 build-examples
 
   tests-sanitize-undefined-gcc:
     runs-on: ubuntu-20.04
@@ -573,6 +575,8 @@ jobs:
         run: make -j4 && ./v -cg -cflags -Werror -o v cmd/v
       - name: Self tests (-fsanitize=undefined)
         run: ./v -cflags "-fsanitize=undefined" -o v2 cmd/v && ./v2 -cflags -fsanitize=undefined test-self
+      - name: Build examples (V compiled with -fsanitize=undefined)
+        run: ./v2 build-examples
 
   tests-sanitize-address-clang:
     runs-on: ubuntu-20.04
@@ -598,6 +602,8 @@ jobs:
         run:
           ./v -cflags -fsanitize=address -o v cmd/v &&
           ASAN_OPTIONS=detect_leaks=0 ./v -cc tcc test-self -asan-compiler
+      - name: Build examples (V compiled with -fsanitize=address)
+        run: ASAN_OPTIONS=detect_leaks=0 ./v build-examples
 
   tests-sanitize-address-msvc:
     runs-on: windows-2019
@@ -648,6 +654,8 @@ jobs:
         run:
           ./v -cflags -fsanitize=address,pointer-compare,pointer-subtract -o v cmd/v &&
           ASAN_OPTIONS=detect_leaks=0 ./v -cc tcc test-self -asan-compiler
+      - name: Build examples (V compiled with -fsanitize=address)
+        run: ASAN_OPTIONS=detect_leaks=0 ./v build-examples
 
   tests-sanitize-memory-clang:
     runs-on: ubuntu-20.04
@@ -672,6 +680,8 @@ jobs:
       - name: Self tests (V compiled with -fsanitize=memory)
         run:
           ./v -cflags -fsanitize=memory -o v cmd/v && ./v -cc tcc test-self -msan-compiler
+      - name: Build examples (V compiled with -fsanitize=memory)
+        run: ./v build-examples
   #  ubuntu-autofree-selfcompile:
   #    runs-on: ubuntu-20.04
   #    timeout-minutes: 30