Update workflow to use ubuntu-20.04 and adjust target to x86_64-unkno…

…wn-linux-gnu

.github/workflows/build_and_upload.yml

@@ -7,8 +7,8 @@ jobs:
     strategy:
       matrix:
         include:
-          - os: ubuntu-latest
-            target: x86_64-unknown-linux-musl
+          - os: ubuntu-20.04
+            target: x86_64-unknown-linux-gnu
             dir: musl
           - os: windows-latest
             target: i686-pc-windows-msvc
@@ -24,7 +24,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Install musl-tools (Linux)
-        if: matrix.os == 'ubuntu-latest'
+        if: matrix.os == 'ubuntu-20.04'
         run: sudo apt-get install -y musl-tools
 
       - name: Install Rust
@@ -69,13 +69,13 @@ jobs:
           mv target/${{ matrix.target }}/release/geph5-client artifacts/${{ matrix.dir }}/
 
       - name: Build bridge and exit
-        if: matrix.os == 'ubuntu-latest'
+        if: matrix.os == 'ubuntu-20.04'
         run: |
           cargo build --locked --release --target ${{ matrix.target }} --manifest-path binaries/geph5-bridge/Cargo.toml
           cargo build --locked --release --target ${{ matrix.target }} --manifest-path binaries/geph5-exit/Cargo.toml
 
       - name: Move client binaries to artifacts directory
-        if: matrix.os == 'ubuntu-latest'
+        if: matrix.os == 'ubuntu-20.04'
         run: |
           mkdir -p artifacts/${{ matrix.dir }}
           mv target/${{ matrix.target }}/release/geph5-bridge artifacts/${{ matrix.dir }}/
@@ -98,7 +98,7 @@ jobs:
 
   upload:
     needs: build
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Download all artifacts
         uses: actions/download-artifact@v2