Use downloaded pandoc instead of relying on it to be installed

Change-Id: I6477b14bafd04b4d44257526c99d816e77661bb0
diff --git a/debian/pandoc.BUILD b/debian/pandoc.BUILD
new file mode 100644
index 0000000..7e3084e
--- /dev/null
+++ b/debian/pandoc.BUILD
@@ -0,0 +1,25 @@
+genrule(
+    name = "gen_wrapper",
+    outs = ["pandoc_wrapper"],
+    cmd = "\n".join([
+        "cat > $@ <<END",
+        "#!/bin/bash",
+        "export LD_LIBRARY_PATH=external/pandoc/usr/lib/x86_64-linux-gnu:external/pandoc/lib/x86_64-linux-gnu",
+        "exec external/pandoc/usr/bin/pandoc \"\\$$@\"",
+        "END",
+    ]),
+    executable = True,
+)
+
+filegroup(
+    name = "pandoc",
+    srcs = ["pandoc_wrapper"],
+    data = glob(["**"]),
+    visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "all_files",
+    srcs = glob(["**"]),
+    visibility = ["//visibility:public"],
+)