Make use of profile clear by '-github' suffix

Additionally, make current release profile potentially faster by allowing
the standard optimizations, probably opt-level 2.

In GitHub release mode, optimize even further as time doesn't matter quite
as much there.

The `build-override` with `opt-leve = 0` was removed in fear this might
actually detremental for folks using `cargo install`.

.github/workflows/release.yml

@@ -139,7 +139,7 @@ jobs:
       TARGET: ${{ matrix.target }}
       TARGET_FLAGS: --target=${{ matrix.target }}
       TARGET_DIR: target/${{ matrix.target }}
-      PROFILE: release-opt
+      PROFILE: release-github
 
     steps:
       - name: Checkout repository

Cargo.toml

@@ -211,15 +211,17 @@ lto = "thin"
 # can wire up the 'abrt' signal handler so tempfiles will be removed in case of panics.
 panic = "unwind"
 incremental = false
-build-override = { opt-level = 0 }
 
 # This profile is currently used in building releases for GitHub.
 # It may be removed at any time and should not otherwise be relied on.
-[profile.release-opt]
+[profile.release-github]
 inherits = "release"
+overflow-checks = false
+panic = "unwind"
 lto = "fat"
 codegen-units = 1
 strip = "symbols"
+build-override = { opt-level = 3 }
 
 [workspace]
 members = [