GitHub-CI: Rename workflows.

* .github/workflows/make-alpine.yaml, .github/workflows/make-cygwin.yaml,
.github/workflows/make-macos.yaml, .github/workflows/make-mingw.yaml,
.github/workflows/make-ubuntu.yaml: Use dedicated name for each of the
workflows.

.github/workflows/make-alpine.yaml

@@ -1,4 +1,4 @@
-name: make
+name: make-alpine
 on: [push]
 concurrency: ci-alpine-${{ github.ref }}
 

.github/workflows/make-cygwin.yaml

@@ -1,4 +1,4 @@
-name: make
+name: make-cygwin
 on: [push]
 concurrency: ci-cygwin-${{ github.ref }}
 

.github/workflows/make-macos.yaml

@@ -1,4 +1,4 @@
-name: make
+name: make-macos
 on: [push]
 concurrency: ci-macos-${{ github.ref }}
 

.github/workflows/make-mingw.yaml

@@ -1,4 +1,4 @@
-name: make
+name: make-mingw
 on: [push]
 concurrency: ci-mingw-${{ github.ref }}
 

.github/workflows/make-ubuntu.yaml

@@ -1,4 +1,4 @@
-name: make
+name: make-ubuntu
 on: [push]
 concurrency: ci-ubuntu-${{ github.ref }}