Add withastro/compiler project (#9210)

cc @natemoo-re

I'm currently trying to set up fuzz testing to augment the existing unit
tests in https://github.com/withastro/compiler. Once this is accepted,
I'll try to integrate CIFuzz for quick feedback on PRs

Using these guides for setup:
- https://google.github.io/oss-fuzz/getting-started/new-project-guide/
-
https://google.github.io/oss-fuzz//getting-started/new-project-guide/go-lang/

I suppose I should try running the Dockerfile locally to see if it
works?

projects/astro-compiler/Dockerfile

@@ -0,0 +1,23 @@
+# Copyright 2020 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+FROM gcr.io/oss-fuzz-base/base-builder-go
+RUN git clone --depth 1 https://github.com/withastro/compiler.git
+
+RUN go install github.com/AdamKorcz/go-118-fuzz-build@latest
+
+COPY build.sh $SRC/
+WORKDIR $SRC/compiler

projects/astro-compiler/build.sh

@@ -0,0 +1,24 @@
+#!/bin/bash -eu
+# Copyright 2020 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+# Fuzz internal/transform
+printf "package transform\nimport _ \"github.com/AdamKorcz/go-118-fuzz-build/testing\"\n" > $SRC/compiler/internal/transform/registerfuzzdep.go
+go mod tidy
+go get -u github.com/AdamKorcz/go-118-fuzz-build/testing
+
+compile_native_go_fuzzer $SRC/compiler/internal/transform FuzzScopeHTML fuzz_scope_html
+compile_native_go_fuzzer $SRC/compiler/internal/transform FuzzTransformScoping fuzz_transform_scoping

projects/astro-compiler/project.yaml

@@ -0,0 +1,10 @@
+homepage: "https://github.com/withastro/compiler"
+language: go
+main_repo: "https://github.com/withastro/compiler"
+primary_contact: "cable023@gmail.com"
+fuzzing_engines:
+  - libfuzzer
+sanitizers:
+  - address
+auto_ccs:
+  - "nate@astro.build"