Fix YAML quoting

.github/workflows/c-cpp.yml

@@ -1,86 +1,78 @@
+---
 name: C/C++ CI
 
-on:
+"on":
   push:
-    branches: [ "main" ]
+    branches: ["main"]
   pull_request:
-    branches: [ "main" ]
+    branches: ["main"]
 
 jobs:
   install-dependencies:
     name: Installing Dependencies
     runs-on: ubuntu-latest
-    container: ghcr.io/gravity-sim/deps:latest
     steps:
       - uses: actions/checkout@v4
-      - name: Setup complete
-        run: echo "Dependencies are pre-installed in the container"
+      - name: Cache build artifacts
+        uses: actions/cache@v3
+        with:
+          path: |
+            src/*.o
+            tests/*.o
+          key: "${{ runner.os }}-build-${{ hashFiles('**/*.c') }}"
+          restore-keys: "${{ runner.os }}-build-"
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y build-essential libgl1-mesa-dev libglew-dev libglfw3-dev libopenmpi-dev
 
   build:
     name: Build
     runs-on: ubuntu-latest
     needs: install-dependencies
-    container: ghcr.io/gravity-sim/deps:latest
     steps:
       - uses: actions/checkout@v4
       - name: Restore build cache
-        id: build-cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache@v3
         with:
           path: |
             src/*.o
             tests/*.o
-          key: ${{ runner.os }}-build-${{ hashFiles('**/*.c') }}
+          key: "${{ runner.os }}-build-${{ hashFiles('**/*.c') }}"
+          restore-keys: "${{ runner.os }}-build-"
       - name: Build
-        run: make
-      - name: Save build cache
-        if: steps.build-cache.outputs.cache-hit != 'true'
-        uses: actions/cache/save@v3
-        with:
-          path: |
-            src/*.o
-            tests/*.o
-          key: ${{ steps.build-cache.outputs.cache-primary-key }}
+        run: make clean && make
 
   test:
     name: Test
     runs-on: ubuntu-latest
     needs: build
-    container: ghcr.io/gravity-sim/deps:latest
     steps:
       - uses: actions/checkout@v4
       - name: Restore build cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache@v3
         with:
           path: |
             src/*.o
             tests/*.o
-          key: ${{ runner.os }}-build-${{ hashFiles('**/*.c') }}
+          key: "${{ runner.os }}-build-${{ hashFiles('**/*.c') }}"
+          restore-keys: "${{ runner.os }}-build-"
       - name: Test
         run: make test
 
   make:
     name: Make
     runs-on: ubuntu-latest
     needs: test
-    container: ghcr.io/gravity-sim/deps:latest
     steps:
-    - uses: actions/checkout@v4
-    - name: Install dependencies
-      run: |
-        sudo apt-get update
-        sudo apt-get install -y build-essential libgl1-mesa-dev libglew-dev libglfw3-dev 
-    - name: Build
-      run: make
-    - name: Test
-      run: make test
       - uses: actions/checkout@v4
       - name: Restore build cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache@v3
         with:
           path: |
             src/*.o
             tests/*.o
-          key: ${{ runner.os }}-build-${{ hashFiles('**/*.c') }}
+          key: "${{ runner.os }}-build-${{ hashFiles('**/*.c') }}"
+          restore-keys: "${{ runner.os }}-build-"
       - name: Make
-        run: make
+        run: make clean && make

README.md

@@ -77,11 +77,11 @@ To set up and compile the project on your local machine, follow these steps:
 
 ## Continuous Integration
 
-This project uses a GitHub Actions workflow that runs inside a prebuilt Docker
-container containing all required OpenGL dependencies. The workflow consists of
-four sequential jobs: **Installing Dependencies**, **Build**, **Test**, and
-**Make**. Compiled object files are cached between jobs to speed up subsequent
-steps.
+This project uses a GitHub Actions workflow with four sequential jobs:
+**Installing Dependencies**, **Build**, **Test**, and **Make**. Each job
+installs the required packages with `apt-get`, and compiled object files are
+cached between jobs to speed up subsequent runs. The build steps run
+`make clean` before `make` to ensure a fresh compilation each time.
 
 ## Usage