ci: attach .deb and .rpm packages to releases and nightlies

Built by nfpm from the static musl binaries, with the man page and the
bash, zsh and fish completions. The names carry no version, so
releases/latest/download/soulseek-rs-amd64.deb stays a working link; the
nightly pair replaces itself on the rolling prerelease.

.github/workflows/nightly.yml

@@ -105,6 +105,12 @@ jobs:
           dry-run: true
           dry-run-intended: true
 
+      - name: Build .deb and .rpm
+        if: endsWith(matrix.target, '-musl')
+        env:
+          TARGET: ${{ matrix.target }}
+        run: sh scripts/package-linux.sh "target/$TARGET/release/soulseek-rs" "$SOULSEEK_RS_VERSION" "$TARGET" . soulseek-rs-nightly
+
       - name: Store packaged binary
         uses: actions/upload-artifact@v4
         with:
@@ -112,6 +118,8 @@ jobs:
           path: |
             ${{ steps.package.outputs.tar || steps.package.outputs.zip }}
             ${{ steps.package.outputs.sha256 }}
+            soulseek-rs-nightly-*.deb
+            soulseek-rs-nightly-*.rpm
           if-no-files-found: error
           retention-days: 1
 
@@ -147,6 +155,10 @@ jobs:
             soulseek-rs-nightly-aarch64-apple-darwin.sha256
             soulseek-rs-nightly-x86_64-pc-windows-msvc.sha256
             soulseek-rs-nightly-aarch64-pc-windows-msvc.sha256
+            soulseek-rs-nightly-amd64.deb
+            soulseek-rs-nightly-arm64.deb
+            soulseek-rs-nightly-x86_64.rpm
+            soulseek-rs-nightly-aarch64.rpm
           )
           printf '%s\n' "${expected[@]}" | sort > "$RUNNER_TEMP/expected-assets"
           find dist -maxdepth 1 -type f -exec basename {} \; | sort > "$RUNNER_TEMP/actual-assets"
@@ -234,6 +246,7 @@ jobs:
     timeout-minutes: 5
     env:
       VERSION: ${{ needs.source.outputs.version }}
+      DOWNLOAD: https://github.com/${{ github.repository }}/releases/download/nightly
     steps:
       - uses: actions/checkout@v4
         with:
@@ -260,3 +273,19 @@ jobs:
           PATH="$RUNNER_TEMP/wget-path" /bin/sh website/public/install.sh --nightly
           "$SOULSEEK_RS_INSTALL_DIR/soulseek-rs" --version | grep -F "$VERSION"
 
+      - name: Install the .deb
+        run: |
+          curl -fsSLO "$DOWNLOAD/soulseek-rs-nightly-amd64.deb"
+          sudo apt-get install -y ./soulseek-rs-nightly-amd64.deb
+          soulseek-rs --version | grep -F "$VERSION"
+          dpkg -L soulseek-rs | grep -Fx /usr/share/man/man1/soulseek-rs.1.gz
+          dpkg -L soulseek-rs | grep -Fx /usr/share/zsh/vendor-completions/_soulseek-rs
+
+      - name: Install the .rpm
+        run: |
+          docker run --rm fedora:latest sh -ec "
+            dnf install -y '$DOWNLOAD/soulseek-rs-nightly-x86_64.rpm'
+            soulseek-rs --version | grep -F '$VERSION'
+            rpm -ql soulseek-rs | grep -Fx /usr/share/man/man1/soulseek-rs.1.gz
+            rpm -ql soulseek-rs | grep -Fx /usr/share/zsh/site-functions/_soulseek-rs
+          "