Build more combinations of statically linked binary

This change adjusts our 'Build' workflow to build not just the "regular"
version of the program but also one with readline support included. We
switch over from using musl libc to glibc, because we need to link
against the distribution provided libreadline.a archive, which includes
references to glibc itself.

.github/workflows/build.yml

@@ -8,19 +8,31 @@ on:
 
 jobs:
   build:
-    name: Build statically linked binary
+    name: Build notnow${{ matrix.suffix }}
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - suffix: ""
+            args: ""
+          - suffix: "-readline"
+            args: "--features=readline"
     steps:
       - uses: actions/checkout@v4
       - name: Install dependencies
         run: sudo apt-get install musl-tools
       - uses: dtolnay/rust-toolchain@stable
-        with:
-          targets: x86_64-unknown-linux-musl
-      - run: |
-          cargo install --bin=notnow --path=. --root=. --target x86_64-unknown-linux-musl
+      - name: Build notnow
+        env:
+          READLINE_STATIC: 1
+          READLINE_LIB_DIR: /usr/lib/x86_64-linux-gnu/
+          RUSTFLAGS: -C target-feature=+crt-static
+        run: |
+          sudo apt-get install libreadline-dev
+          cargo install --bin=notnow --path=. --root=. --target x86_64-unknown-linux-gnu ${{ matrix.args }}
           strip bin/notnow
       - uses: actions/upload-artifact@v4
         with:
-          name: notnow
+          name: notnow${{ matrix.suffix }}
           path: bin/notnow

Cargo.toml

@@ -91,7 +91,7 @@ version = "0.2"
 version = "0.1.3"
 
 [dependencies.rline]
-version = "0.3"
+version = "0.3.2"
 optional = true
 
 [dependencies.serde]