fix: resolve YAML parse error in release.yml CI workflow

Column-0 lines inside run: | blocks (Python -c script and C heredoc)
caused Gitea's YAML parser to terminate the literal block early, resulting
in a 500 error on every workflow_dispatch call. Fix by collapsing the
Python to a single line and moving the C source into tools/ld_wrapper.c
so CI can compile it directly without any heredoc.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -159,33 +159,14 @@ jobs:
           cp tools/AppRun-x86_64 ~/.cache/tauri/AppRun-x86_64
           chmod +x ~/.cache/tauri/AppRun-x86_64
 
-          # Download and extract linuxdeploy without FUSE.
-          # Tauri also runs `dd if=/dev/zero bs=1 count=3 seek=8` on the cached file
-          # to hide AppImage magic bytes — this corrupts a shell script's shebang.
-          # A compiled ELF binary is safe: bytes 8-10 (EI_OSABI/EI_ABIVERSION/pad)
-          # are already zero in standard ELF and survive the dd no-op.
           wget -q \
             "https://github.com/tauri-apps/binary-releases/releases/download/linuxdeploy/linuxdeploy-x86_64.AppImage" \
             -O /tmp/linuxdeploy.AppImage
 
-          # Find squashfs at a page-aligned boundary after the ELF runtime
-          OFFSET=$(python3 -c "
-d=open('/tmp/linuxdeploy.AppImage','rb').read()
-for i in range(4096,len(d),4096):
-    if d[i:i+4] in (b'hsqs',b'sqsh'):
-        print(i); break
-")
+          OFFSET=$(python3 -c "d=open('/tmp/linuxdeploy.AppImage','rb').read();next(print(i) for i in range(4096,len(d),4096) if d[i:i+4] in (b'hsqs',b'sqsh'))")
           unsquashfs -d /tmp/linuxdeploy-root -offset "$OFFSET" /tmp/linuxdeploy.AppImage
 
-          # Compile a tiny ELF forwarder as the cached AppImage entry point
-          cat > /tmp/ld_wrapper.c << 'CSRC'
-#include <unistd.h>
-int main(int argc, char** argv) {
-    execv("/tmp/linuxdeploy-root/AppRun", argv);
-    return 1;
-}
-CSRC
-          gcc -o ~/.cache/tauri/linuxdeploy-x86_64.AppImage /tmp/ld_wrapper.c
+          gcc -o ~/.cache/tauri/linuxdeploy-x86_64.AppImage tools/ld_wrapper.c
           chmod +x ~/.cache/tauri/linuxdeploy-x86_64.AppImage
 
       - name: Build

tools/ld_wrapper.c

@@ -0,0 +1,5 @@
+#include <unistd.h>
+int main(int argc, char **argv) {
+    execv("/tmp/linuxdeploy-root/AppRun", argv);
+    return 1;
+}