fix idempotency in app.sh, service.sh and nginx reload in cert handler

tools/service.sh

@@ -156,15 +156,23 @@ cmd_dns() {
 cmd_files() {
     local name="$1"
 
-    if [ -d "$REPO_ROOT/docker/$name" ]; then
-        echo "Error: docker/$name already exists."
-        exit 1
+    local all_exist=true
+    for f in "docker/$name/compose.yml" ".gitea/workflows/deploy-$name.yml"; do
+        if [ ! -e "$REPO_ROOT/$f" ]; then
+            all_exist=false
+            break
+        fi
+    done
+    if [ "$all_exist" = true ]; then
+        echo "  All files already exist, skipping."
+        return
     fi
 
-    echo "==> Creating docker/$name/compose.yml..."
-    mkdir -p "$REPO_ROOT/docker/$name"
-    touch "$REPO_ROOT/docker/$name/.gitignore"
-    cat > "$REPO_ROOT/docker/$name/compose.yml" <<EOF
+    if [ ! -e "$REPO_ROOT/docker/$name/compose.yml" ]; then
+        echo "==> Creating docker/$name/compose.yml..."
+        mkdir -p "$REPO_ROOT/docker/$name"
+        touch "$REPO_ROOT/docker/$name/.gitignore"
+        cat > "$REPO_ROOT/docker/$name/compose.yml" <<EOF
 services:
   $name:
     image: TODO
@@ -177,10 +185,14 @@ networks:
   shared:
     external: true
 EOF
+    else
+        echo "  docker/$name/compose.yml already exists, skipping."
+    fi
 
-    echo "==> Creating .gitea/workflows/deploy-$name.yml..."
-    mkdir -p "$REPO_ROOT/.gitea/workflows"
-    cat > "$REPO_ROOT/.gitea/workflows/deploy-$name.yml" <<'OUTER'
+    if [ ! -e "$REPO_ROOT/.gitea/workflows/deploy-$name.yml" ]; then
+        echo "==> Creating .gitea/workflows/deploy-$name.yml..."
+        mkdir -p "$REPO_ROOT/.gitea/workflows"
+        cat > "$REPO_ROOT/.gitea/workflows/deploy-$name.yml" <<'OUTER'
 name: Deploy APP_PLACEHOLDER
 
 on:
@@ -201,7 +213,10 @@ jobs:
           chmod 600 ~/.ssh/deploy_key
           ssh -o StrictHostKeyChecking=yes -i ~/.ssh/deploy_key deploy@${{ vars.DEPLOY_HOST }} deploy-APP_PLACEHOLDER
 OUTER
-    sed -i "s/APP_PLACEHOLDER/$name/g" "$REPO_ROOT/.gitea/workflows/deploy-$name.yml"
+        sed -i "s/APP_PLACEHOLDER/$name/g" "$REPO_ROOT/.gitea/workflows/deploy-$name.yml"
+    else
+        echo "  .gitea/workflows/deploy-$name.yml already exists, skipping."
+    fi
 
     echo ""
     echo "Done. Edit docker/$name/compose.yml, then commit and push."