Get Docker really working

- Adds `docker.toml` with working values
- Container layout uses /bin, /etc now
- Adds docker-compose
- Uses docker-ignore to reduce build context size

.dockerignore

@@ -0,0 +1,6 @@
+# Let's only send the bits we need, no matter how cluttered the develompent
+# folder gets.  Ignore everything, then un-ignore critical files.
+*
+!*.go
+!/go.*
+!/docker.toml

Dockerfile

@@ -6,7 +6,7 @@ COPY . .
 RUN go build -o /out/devproxy2 && strip /out/devproxy2
 
 FROM scratch AS bin
-COPY --from=build /out/devproxy2 /
-COPY ./devproxy.toml /
+COPY --from=build /out/devproxy2 /bin/devproxy2
+COPY ./docker.toml /etc/devproxy.toml
 EXPOSE 8111/tcp
-ENTRYPOINT ["/devproxy2"]
+ENTRYPOINT ["/bin/devproxy2"]

docker-compose.yml

@@ -0,0 +1,10 @@
+version: "3.8"
+services:
+  proxy:
+    build:
+      context: .
+      cache_from:
+        - "golang:1.13-alpine"
+    image: devproxy2
+    ports:
+      - "8111:8111"

docker.toml

@@ -0,0 +1,18 @@
+# Default configuration used by the Dockerfile.
+[listen]
+# Don't actually listen on 'localhost'.  It's a secure default for a host
+# system, but in Docker, it prevents connections to the exposed port.
+address = ""
+
+[servers.local]
+# Since "localhost" is the container, we use "host.docker.internal" to get to
+# the actual host machine (requires Docker 18.03+ on Windows or Mac, or
+# Docker 20.10+ on Linux)
+address = "host.docker.internal"
+http_port = 8080
+https_port = 8443
+
+[[rules]]
+match_host = '\bexample\.\w+$'
+match_port = '^80$'
+send_to = "local"