ci: use shebang with better portability in shell scripts, format shell scripts (#21605)

.github/workflows/compile_shaders_in_examples.sh

@@ -1,7 +1,7 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 for f in examples/sokol/*/ ; do
-    echo "compiling shaders for $f ...";
-    time ./v shader $f;
+	echo "compiling shaders for $f ...";
+	time ./v shader $f;
 	echo "done";
 done;

.github/workflows/compile_v_with_vtcc.sh

@@ -1,9 +1,9 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -ex
 
 function show() {
-  printf "\u001b[35m$1\u001b[0m\n"
+	printf "\u001b[35m$1\u001b[0m\n"
 }
 
 show "Prepare"