GitHub Actions: use latest spack

- Checkout develop branch of spack for latest mochi-margo
- Update checkout action to remove warning
- Update packages.yaml
- Add `spack external find` to locate correct cmake
- Edit spack config to use old behavior of `spack load` updating
`LD_LIBRARY_PATH`
- Update `PKG_CONFIG_PATH` so all compilers can find openssl

Author: CamStan

.github/workflows/build-and-test.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: [ ubuntu-latest ]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         fetch-depth: 2
 
@@ -39,11 +39,11 @@ jobs:
     steps:
     - name: Push checkout
       if: github.event_name == 'push'
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: PR checkout
       if: github.event_name == 'pull_request'
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         ref: ${{ github.event.pull_request.head.sha }}
 
@@ -61,6 +61,8 @@ jobs:
 
     - name: Install Spack
       uses: kzscisoft/install-spack@v1
+      with:
+        version: develop
 
     - name: Set up packages.yaml
       run: |
@@ -80,11 +82,6 @@ jobs:
             externals:
             - spec: "[email protected]"
               prefix: /usr
-          cmake:
-            buildable: False
-            externals:
-            - spec: "[email protected]"
-              prefix: /usr
           libtool:
             buildable: False
             externals:
@@ -100,6 +97,11 @@ jobs:
             externals:
             - spec: "[email protected]"
               prefix: /usr
+          openssl:
+            buildable: False
+            externals:
+            - spec: "[email protected]"
+              prefix: /usr
           pkg-config:
             buildable: False
             externals:
@@ -118,6 +120,9 @@ jobs:
         else
           spack config add "packages:all:compiler:[[email protected]]"
         fi
+        spack external find
+        spack config add modules:prefix_inspections:lib64:[LD_LIBRARY_PATH]
+        spack config add modules:prefix_inspections:lib:[LD_LIBRARY_PATH]
 
     - name: Install UnifyFS dependencies
       run: |
@@ -129,6 +134,7 @@ jobs:
 
     - name: Configure and Build
       run: |
+        export PKG_CONFIG_PATH=/usr/lib/x86_64-linux-gnu/pkgconfig
         source $GITHUB_WORKSPACE/.spack/share/spack/setup-env.sh
         spack load gotcha && spack load argobots && spack load mercury && spack load mochi-margo && spack load spath
         ./autogen.sh