Skip post setup mambaforge in Continuous Integration (#2220)

Reduce time spent by `conda-incubator/setup-miniconda` on the 'Post Setup Mambaforge' step, especially on Windows which could take ~4-6 minutes.

Author: weiji14

.github/workflows/cache_data.yaml

@@ -33,6 +33,7 @@ jobs:
           miniforge-version: latest
           miniforge-variant: Mambaforge
           mamba-version: "*"
+          run-post: false
           use-mamba: true
 
       # Install GMT and other required dependencies from conda-forge

.github/workflows/ci_docs.yml

@@ -64,6 +64,7 @@ jobs:
           miniforge-version: latest
           miniforge-variant: Mambaforge
           mamba-version: "*"
+          run-post: false
           use-mamba: true
 
       # Install GMT and other required dependencies from conda-forge

.github/workflows/ci_tests.yaml

@@ -84,6 +84,7 @@ jobs:
           miniforge-version: latest
           miniforge-variant: Mambaforge
           mamba-version: "*"
+          run-post: false
           use-mamba: true
 
       # Install GMT and other required dependencies from conda-forge

.github/workflows/ci_tests_dev.yaml

@@ -90,6 +90,7 @@ jobs:
           miniforge-version: latest
           miniforge-variant: Mambaforge
           mamba-version: "*"
+          run-post: false
           use-mamba: true
 
       # Install dependencies from conda-forge

.github/workflows/ci_tests_legacy.yaml

@@ -58,6 +58,7 @@ jobs:
           miniforge-version: latest
           miniforge-variant: Mambaforge
           mamba-version: "*"
+          run-post: false
           use-mamba: true
 
       # Install GMT and other required dependencies from conda-forge