Use ubuntu 20.04 for builds, because some people still use it

.github/workflows/release.yml

@@ -10,9 +10,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-20.04, windows-latest]
         include:
-          - os: ubuntu-latest
+          - os: ubuntu-20.04
             target: x86_64-unknown-linux-gnu
             target_alias: linux-x86_64
             bin_suffix: ''
@@ -29,7 +29,9 @@ jobs:
       ARCHIVE_PATH: encrypted-dns_${{ github.ref_name }}_${{ matrix.target_alias }}${{ matrix.archive_suffix }}
 
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
+
+      - uses: goto-bus-stop/setup-zig@v2
 
       - uses: hecrj/setup-rust-action@master
         with:
@@ -45,20 +47,20 @@ jobs:
       - name: Build
         run: |
           echo 'lto = "fat"' >> Cargo.toml
-          env RUSTFLAGS="-C link-arg=-s" cargo build --release
+          env RUSTFLAGS="-C strip=symbols" cargo build --release
           mkdir encrypted-dns
           cp target/release/encrypted-dns${{ matrix.bin_suffix }} encrypted-dns/
           cp README.md example-encrypted-dns.toml encrypted-dns/
-          if [ "${{ matrix.os }}" = "ubuntu-latest" ]; then
+          if [ "${{ matrix.os }}" = "ubuntu-20.04" ]; then
             tar cjpf ${ARCHIVE_PATH} encrypted-dns
           elif [ "${{ matrix.os }}" = "windows-latest" ]; then
             "/C/Program Files/7-Zip/7z" a ${ARCHIVE_PATH} encrypted-dns
           fi
 
       - name: Install cargo-deb and build Debian package
-        if: ${{ matrix.os == 'ubuntu-latest' }}
+        if: ${{ matrix.os == 'ubuntu-20.04' }}
         run: |
-          cargo install --debug cargo-deb
+          cargo install cargo-deb
           cargo deb --output=encrypted-dns_${{ github.ref_name }}_amd64.deb --no-build
 
       - uses: actions/upload-artifact@master
@@ -67,7 +69,7 @@ jobs:
           path: ${{ env.ARCHIVE_PATH }}
 
       - uses: actions/upload-artifact@master
-        if: ${{ matrix.os == 'ubuntu-latest' }}
+        if: ${{ matrix.os == 'ubuntu-20.04' }}
         with:
           name: encrypted-dns_deb-amd64
           path: encrypted-dns_${{ github.ref_name }}_amd64.deb
@@ -76,7 +78,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/')
     needs:
       - build
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
       - uses: actions/download-artifact@v3