fix(git-tools): validate Gitea merge API payload

packages/mosaic/framework/tools/git/test-pr-merge-gitea-empty-uid.sh

@@ -39,6 +39,7 @@ printf '\n' >> "$PR_MERGE_TEST_LOG"
 args=" $* "
 out_file=""
 write_code=false
+post_data=""
 prev=""
 for arg in "$@"; do
     if [[ "$prev" == "-o" ]]; then
@@ -46,10 +47,19 @@ for arg in "$@"; do
         prev=""
         continue
     fi
+    if [[ "$prev" == "-d" ]]; then
+        post_data="$arg"
+        prev=""
+        continue
+    fi
     if [[ "$arg" == "-o" ]]; then
         prev="-o"
         continue
     fi
+    if [[ "$arg" == "-d" ]]; then
+        prev="-d"
+        continue
+    fi
     if [[ "$arg" == "-w" ]]; then
         write_code=true
     fi
@@ -70,6 +80,10 @@ if [[ "$args" == *"/api/v1/repos/mosaicstack/stack/pulls/123"* && "$args" != *"/
     exit 0
 fi
 if [[ "$args" == *"-X POST"* && "$args" == *"/api/v1/repos/mosaicstack/stack/pulls/123/merge"* ]]; then
+    if [[ "$post_data" != '{"Do":"squash"}' ]]; then
+        echo "unexpected merge payload: $post_data" >&2
+        exit 96
+    fi
     emit_response '{"merged":true,"message":"mock merge complete"}'
     exit 0
 fi