Fix installation to work with bash and all versions of shell

.github/workflows/install.yml

@@ -16,15 +16,15 @@ jobs:
 
     steps:
       - name: Install defang (latest)
-        run: . <(curl -Ls https://s.defang.io/install)
+        run: curl -Ls https://s.defang.io/install | bash
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} # avoid rate limiting
 
       - name: Sanity check
         run: defang --version
 
       - name: Install defang (specific version)
-        run: . <(curl -Ls https://s.defang.io/install)
+        run: curl -Ls https://s.defang.io/install | bash
         env:
           DEFANG_INSTALL_VERSION: v0.5.36
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # alt name

README.md

@@ -29,7 +29,7 @@ Install the Defang CLI from one of the following sources:
 
 * Using a shell script:
   ```
-  . <(curl -Ls https://s.defang.io/install)
+  curl -Ls https://s.defang.io/install | bash
   ```
 
 * Using [Go](https://go.dev):

src/bin/install

@@ -3,7 +3,7 @@
 # This script installs the latest release of defang from GitHub. It is designed                #
 # to be run like this:                                                                         #
 #                                                                                              #
-# . <(curl -Ls https://s.defang.io/install)                                                    #
+# curl -Ls https://s.defang.io/install | bash                                               #
 #                                                                                              #
 # This allows us to do some interactive stuff where we can prompt the user for input.          #
 #                                                                                              #

src/pkg/cli/upgrade.go

@@ -49,7 +49,7 @@ func Upgrade(ctx context.Context) error {
 	}
 
 	// Default to the shell script
-	printInstructions(`. <(curl -Ls https://s.defang.io/install)`)
+	printInstructions(`curl -Ls https://s.defang.io/install | bash`)
 
 	return nil
 }