Check for writes outside of the build directory

ChangeLog:

	* .github/workflows/ccpp.yml: Make files outside the build
	directory read-only.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>

.github/workflows/ccpp.yml

@@ -41,6 +41,9 @@ jobs:
           # install Rust directly using rustup
           curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
 
+    - name: Make Source Read-Only
+      run: chmod -R a-w ./*
+
     - name: Configure
       run: |
            mkdir -p gccrs-build;
@@ -122,6 +125,9 @@ jobs:
           # install Rust directly using rustup
           curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
 
+    - name: Make Source Read-Only
+      run: chmod -R a-w ./*
+
     - name: Configure
       run: |
            mkdir -p gccrs-build;
@@ -205,6 +211,9 @@ jobs:
           # install Rust directly using rustup
           curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
 
+    - name: Make Source Read-Only
+      run: chmod -R a-w ./*
+
     - name: Configure
       run: |
            mkdir -p gccrs-build;
@@ -264,6 +273,9 @@ jobs:
           # install Rust directly using rustup
           curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
 
+    - name: Make Source Read-Only
+      run: chmod -R a-w ./*
+
     - name: Configure
       run: |
            mkdir -p gccrs-build;