Add Docker compose files and benchmark to POSIX storage

.github/workflows/benchmark.yml

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+name: Benchmark
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  benchmark-mysql:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+      - name: Start Tessera
+        run: docker compose -f ./cmd/example-mysql/docker/compose.yaml up --build --detach
+      - name: Run benchmark
+        run: go run ./hammer --log_public_key=Test-Betty+df84580a+AQQASqPUZoIHcJAF5mBOryctwFdTV1E0GRY4kEAtTzwB --log_url=http://localhost:2024 --max_read_ops=0 --num_writers=512 --max_write_ops=512 --max_runtime=1m --leaf_write_goal=2500 --show_ui=false
+      - name: Stop Tessera
+        if: ${{ always() }}
+        run: docker compose -f ./cmd/example-mysql/docker/compose.yaml down
+
+  benchmark-posix:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+      - name: Start Tessera
+        run: docker compose -f ./cmd/example-posix/docker/compose.yaml up --build --detach
+      - name: Run benchmark
+        run: go run ./hammer --log_public_key=example.com/log/testdata+33d7b496+AeHTu4Q3hEIMHNqc6fASMsq3rKNx280NI+oO5xCFkkSx --log_url=http://localhost:2024 --write_log_url=http://localhost:2025 --max_read_ops=0 --num_writers=512 --max_write_ops=512 --max_runtime=1m --leaf_write_goal=2500 --show_ui=false
+      - name: Stop Tessera
+        if: ${{ always() }}
+        run: docker compose -f ./cmd/example-posix/docker/compose.yaml down

cmd/example-posix/docker/Dockerfile

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+FROM golang:1.23.0-alpine3.19@sha256:fe8f9c7d418d3ac91787f11c31071c4814b6da5f9aae55bc581a7aacc264c395 AS build
+
+WORKDIR /build
+
+# pre-copy/cache go.mod for pre-downloading dependencies and only redownloading them in subsequent builds if they change
+COPY go.mod go.sum ./
+RUN go mod download && go mod verify
+
+COPY . .
+RUN CGO_ENABLED=0 go build -v ./cmd/example-posix
+
+FROM alpine:3.20@sha256:0a4eaa0eecf5f8c050e5bba433f58c052be7587ee8af3e8b3910ef9ab5fbe9f5
+
+COPY --from=build /build/example-posix /
+
+ENTRYPOINT ["/example-posix"]

cmd/example-posix/docker/compose.yaml

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+services:
+
+  tessera-example-posix-read-proxy:
+    container_name: tessera-example-posix-read-proxy
+    image: "busybox:stable"
+    ports:
+      - "2024:2024"
+    command: [
+      "/bin/busybox", 
+      "httpd", 
+      "-f", 
+      "-p", 
+      "2024",
+      "-h",
+      "/tmp/tessera-posix-log"
+    ]
+    volumes:
+      - tiles:/tmp/tessera-posix-log
+    restart: always 
+
+  tessera-example-posix:
+    container_name: tessera-example-posix
+    build:
+      context: ../../../
+      dockerfile: ./cmd/example-posix/docker/Dockerfile
+    ports:
+      - "2025:2025"
+    environment:
+      LOG_PRIVATE_KEY: "PRIVATE+KEY+example.com/log/testdata+33d7b496+AeymY/SZAX0jZcJ8enZ5FY1Dz+wTML2yWSkK+9DSF3eg"
+      LOG_PUBLIC_KEY: "example.com/log/testdata+33d7b496+AeHTu4Q3hEIMHNqc6fASMsq3rKNx280NI+oO5xCFkkSx"
+    command: [
+      "--storage_dir=/tmp/tessera-posix-log",
+      "--initialise",
+      "--listen=:2025",
+      "--alsologtostderr",
+      "--v=2",
+    ]
+    volumes:
+      - tiles:/tmp/tessera-posix-log
+    restart: always
+
+volumes:
+  tiles:
+    name: "tiles"