Add integration tests

.github/workflows/integration-test.yaml

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+name: Integration Tests
+on:
+  pull_request:
+    branches:
+      - master
+    paths-ignore:
+    - '**.md'
+    - 'Makefile'
+    - 'config.json'
+
+jobs:
+  glib_malloc:
+    name: Glib malloc RAM usage test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Build image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          platforms: linux/amd64
+          push: false
+          tags: ghcr.io/webp-sh/webp_server_go
+
+      - name: Start the container
+        run: |
+          cp tests/glib_malloc/docker-compose.yml ./
+          docker-compose up -d
+    
+      - name: Send Requests to Server
+        run: |
+          cd pics
+          find * -type f -print | xargs -I {} curl -H "User-Agent: Mozilla/5.0 Gecko/20100101 Firefox/98.0" http://localhost:3333/{}
+
+      - name: Get container RAM stats
+        run: |
+          docker stats --no-stream
+
+  jemalloc:
+    name: jemalloc RAM usage test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Build image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          platforms: linux/amd64
+          push: false
+          tags: ghcr.io/webp-sh/webp_server_go
+
+      - name: Start the container
+        run: |
+          cp tests/jemalloc/docker-compose.yml ./
+          docker-compose up -d
+    
+      - name: Send Requests to Server
+        run: |
+          cd pics
+          find * -type f -print | xargs -I {} curl -H "User-Agent: Mozilla/5.0 Gecko/20100101 Firefox/98.0" http://localhost:3333/{}
+
+      - name: Get container RAM stats
+        run: |
+          docker stats --no-stream

tests/glib_malloc/docker-compose.yml

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+version: '3'
+
+services:
+  webp:
+    image: webpsh/webp-server-go
+    restart: always
+    environment:
+      - MALLOC_ARENA_MAX=1
+    volumes:
+      - ./pics:/opt/pics
+      - ./exhaust:/opt/exhaust
+    ports:
+      -  127.0.0.1:3333:3333

tests/jemalloc/docker-compose.yml

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+version: '3'
+
+services:
+  webp:
+    image: webpsh/webp-server-go
+    restart: always
+    environment:
+      - MALLOC_ARENA_MAX=1
+      - LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.2
+    volumes:
+      - ./pics:/opt/pics
+      - ./exhaust:/opt/exhaust
+    ports:
+      -  127.0.0.1:3333:3333