ci(release): revert explicit --release (fragile); rely on mcpp.toml default-profile

The 0.0.77 release failed at the musl build step with 'unknown option: --release':
release.yml's bootstrap (`xlings install mcpp`) can resolve an OLDER mcpp (stale
CI index → old 'latest') that predates the --release flag, even though the pin is
0.0.76. So explicit --release in the release pipeline is fragile. The robust
mechanism is mcpp.toml's default-profile="release", which keeps the shipped
artifact -O2 with no flag (old bootstraps default to release anyway, 0.0.76+ read
the manifest knob). Reverts #16's change.

Author: Sunrisepeak

.github/workflows/release.yml

@@ -128,7 +128,7 @@ jobs:
 
           # Build first so we can strip the ELF before pack copies it.
           export MCPP_VENDORED_XLINGS="$XLINGS_BIN"
-          "$MCPP" build --release --target x86_64-linux-musl
+          "$MCPP" build --target x86_64-linux-musl
           ARTIFACT=$(find target/x86_64-linux-musl -type f -name mcpp | head -1)
           test -n "$ARTIFACT"
           file "$ARTIFACT" | grep -q 'statically linked'
@@ -307,10 +307,10 @@ jobs:
           # (the feature landed after the last release), so it resolves the
           # x86_64 host musl-gcc for an aarch64 target. Two-stage instead: build
           # THIS release's x86_64 mcpp first, then cross-build aarch64 with it.
-          mcpp build --release --target x86_64-linux-musl
+          mcpp build --target x86_64-linux-musl
           FRESH=$(find target/x86_64-linux-musl -type f -name mcpp | head -1)
           test -n "$FRESH"
-          "$FRESH" build --release --target aarch64-linux-musl
+          "$FRESH" build --target aarch64-linux-musl
           BIN=$(find target/aarch64-linux-musl -type f -name mcpp | head -1)
           test -n "$BIN"
           file "$BIN" | grep -q 'ARM aarch64'
@@ -455,7 +455,7 @@ jobs:
           # bootstrap's macOS link path predates the staticStdlib
           # implementation (hardcoded -lc++), so stage 1 links the system
           # libc++ — fine, it only needs to RUN on this runner.
-          "$MCPP" build --release
+          "$MCPP" build
           STAGE1=$(find target -path "*/bin/mcpp" | head -1)
           STAGE1=$(cd "$(dirname "$STAGE1")" && pwd)/$(basename "$STAGE1")
           "$STAGE1" --version
@@ -466,7 +466,7 @@ jobs:
           # fingerprint includes the deployment target; the bootstrap's
           # did not) — pick the most recently modified binary, not the
           # first find hit.
-          "$STAGE1" build --release --no-cache
+          "$STAGE1" build --no-cache
           MCPP_BIN=$(ls -t $(find target -path "*/bin/mcpp" -type f) | head -1)
           MCPP_BIN=$(cd "$(dirname "$MCPP_BIN")" && pwd)/$(basename "$MCPP_BIN")
           test -x "$MCPP_BIN"
@@ -629,7 +629,7 @@ jobs:
         run: |
           export MCPP_VENDORED_XLINGS="$XLINGS_BIN"
 
-          "$MCPP" build --release
+          "$MCPP" build
 
           MCPP_BIN=$(find target -name "mcpp.exe" -path "*/bin/*" | head -1)
           test -n "$MCPP_BIN" || { echo "FAIL: no mcpp.exe in target/"; exit 1; }